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Donald Trump has warned that Theresa May 's Brexit plan would "kill" chances of any US-UK trade deal .
The US president, who is currently in the UK on a four-day working visit, claimed that any attempt to keep close ties with the European Union would make a future trade deal with the US unlikely.
Mr Trump added that he had advised Ms May against pursuing a soft Brexit strategy but said she "didn't listen" to him.
Ms May's plans involve the UK seeking something very similar to a single market for goods and a “facilitated customs arrangement" which would essentially create a common rulebook with the EU.
Mr Trump said such a move would make any future negotiations with the US difficult.
“If they do a deal like that, we would be dealing with the European Union instead of dealing with the UK, so it will probably kill the deal," he told The Sun .
Mr Trump also said he believed that Boris Johnson, the former foreign secretary, would make a "great prime minister", describing him as a "very talented guy".
“I have a lot of respect for Boris. He obviously likes me, and says very good things about me," Mr Trump said.
Donald Trump UK visit: protests, placards and puttingShow all 100 1 /100Donald Trump UK visit: protests, placards and putting Donald Trump UK visit: protests, placards and putting Britain's Prime Minister Theresa May and US President Donald Trump walk to a joint news conference holding hands
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Donald Trump UK visit: protests, placards and putting People march holding anti-Trump signs in Edinburgh while the US. President is visiting Trump Turnberry Luxury Collection Resort in Scotland
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Donald Trump UK visit: protests, placards and putting President Donald Trump and first lady Melania Trump depart from Glasgow Prestwick Airport
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Donald Trump UK visit: protests, placards and putting Trump on the back
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Donald Trump UK visit: protests, placards and putting President Donald Trump waves whilst playing a round of golf at Trump Turnberry Luxury Collection Resort
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Donald Trump UK visit: protests, placards and putting Donut TrumpScotland United Against Trump demonstrators gather at the Scottish Parliament in Edinburgh
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Donald Trump UK visit: protests, placards and putting Donald Trump plays a round of golf at Trump Turnberry
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Donald Trump UK visit: protests, placards and putting People march holding anti-Trump signs
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Donald Trump UK visit: protests, placards and putting Trump waves form golf course
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Donald Trump UK visit: protests, placards and putting Trump goes for a stroll
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Donald Trump UK visit: protests, placards and putting Trump blimpA giant balloon depicting US President Donald Trump as an orange baby is launched as protesters gather in the Meadows, after taking part in the Scotland United Against Trump march through the streets of Edinburgh
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Donald Trump UK visit: protests, placards and putting U.S. President Donald Trump drives his golf buggy
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Donald Trump UK visit: protests, placards and putting A Greenpeace protester flying a microlight passes over Donald Trump's resort in Turnberry
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Donald Trump UK visit: protests, placards and putting President Donald Trump and first lady Melania Trump look at the media during their arrival on Air Force One at Glasgow Prestwick Airport in Scotland
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Donald Trump UK visit: protests, placards and putting Scotland United Against Trump demonstrators gather at the Scottish Parliament in Edinburgh
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Donald Trump UK visit: protests, placards and putting Security and police teams surround the perimeter of Trmup's golf course
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Donald Trump UK visit: protests, placards and putting Scotland United Against Trump demonstrators
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Donald Trump UK visit: protests, placards and putting Teams of police officers patrol the beach outside near Trump Turnberry Luxury Collection Resort
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Donald Trump UK visit: protests, placards and putting Pro-Trump supporters demonstrate outside the US Embassy in support of President Donald Trump's visit to the UK, in London
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Donald Trump UK visit: protests, placards and putting Scottish Labour leader, Richard Leonard speaks to crowd
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Donald Trump UK visit: protests, placards and putting Ex-pat
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Donald Trump UK visit: protests, placards and putting Demonstrators hold placards near the golf resort owned by US President
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Donald Trump UK visit: protests, placards and putting Protesters wear orange face makeup
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Donald Trump UK visit: protests, placards and putting Pro-Trump supporters demonstrate outside the US Embassy in London
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Donald Trump UK visit: protests, placards and putting Trump protestors on the beach near to the Trump Turnberry resort
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Donald Trump UK visit: protests, placards and putting Protestors against the UK visit of US President Donald Trump near Aberdeen
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Donald Trump UK visit: protests, placards and putting A mounted police officer patrols anti-Trump rally
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Donald Trump UK visit: protests, placards and putting Trump supporter Bill McGibbon outside his cottage near to the Trump Turnberry resort in South Ayrshire
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Donald Trump UK visit: protests, placards and putting Queen Elizabeth II and President Donald Trump inspect an honour guard at Windsor Castle
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Donald Trump UK visit: protests, placards and putting Queen Elizabeth II stands with US President Donald Trump and his wife, Melania, during their visit to Windsor Castle
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Donald Trump UK visit: protests, placards and putting Donald Trump walks ahead of Queen Elizabeth
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Donald Trump UK visit: protests, placards and putting Donald and Melania Trump listen to the Coldstream Guards, play the US national anthem next to the Queen
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Donald Trump UK visit: protests, placards and putting Protesters in Windor
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Donald Trump UK visit: protests, placards and putting US President Donald Trump and first lady Melanie Trump are greeted by Queen Elizabeth II, during an arrival ceremony with the Guard of Honour at Windsor
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Donald Trump UK visit: protests, placards and putting Queen Elizabeth II waits to greet US President Donald Trump as he arrives by helicopter
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Donald Trump UK visit: protests, placards and putting Ed Miliband joins the march
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Donald Trump UK visit: protests, placards and putting Protestors hold banners
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Donald Trump UK visit: protests, placards and putting Protests at Trump visit
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Donald Trump UK visit: protests, placards and putting Trump and May
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Donald Trump UK visit: protests, placards and putting Protesters for the 'Stop Trump' Women's March gather in London
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Donald Trump UK visit: protests, placards and putting US President Donald Trump and Britain's Prime Minister Theresa May hold a joint press conference
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Donald Trump UK visit: protests, placards and putting Donald Trump and Theresa May attend a press conference
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Donald Trump UK visit: protests, placards and putting Demonstrators protest against the visit of U.S. President Donald Trump
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Donald Trump UK visit: protests, placards and putting Prime Minister Theresa May walks with US President Donald Trump at Chequers
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Donald Trump UK visit: protests, placards and putting Donald Trump UK protest
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Donald Trump UK visit: protests, placards and putting First Lady, Melania Trump, tries her hand at bowls
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Donald Trump UK visit: protests, placards and putting US President and British Prime Minister at Chequers
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Donald Trump UK visit: protests, placards and putting Demonstrator in Black Lives matter T-shirt
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Donald Trump UK visit: protests, placards and putting Theresa May and Donald Trump enter Chequers
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Donald Trump UK visit: protests, placards and putting Protestors wearing Donald Trump and Theresa May paper mache heads join the protest in Butler's Cross
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Donald Trump UK visit: protests, placards and putting First Lady, Melania Trump, looks on as Philip May tries bowls
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Donald Trump UK visit: protests, placards and putting American Psycho poster
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Donald Trump UK visit: protests, placards and putting First Lady, Melania Trump, reacts as she tries her hand at bowls
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Donald Trump UK visit: protests, placards and putting Donald Trump protest in London
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Donald Trump UK visit: protests, placards and putting Theresa May, Donald Trump with US ambassador to the United Kingdom Woody Johnson and British Foreign Secretary Jeremy Hunt at the start of the bilateral meeting at Chequers
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Donald Trump UK visit: protests, placards and putting Melania Trump and Philip May wave flags
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Donald Trump UK visit: protests, placards and putting Donald Trump is greeted by Theresa May
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Donald Trump UK visit: protests, placards and putting The US First Lady Melania Trump, helps children to make poppies
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Donald Trump UK visit: protests, placards and putting The handshake between Donald Trump and Theresa May
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Donald Trump UK visit: protests, placards and putting Demonstrators raise a six meter high effigy of Donald Trump
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Donald Trump UK visit: protests, placards and putting Donald Trump stands alongside Theresa May after he arrived for talks at Chequers, her country residence in Buckinghamshire
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Donald Trump UK visit: protests, placards and putting A six-meter high cartoon baby blimp of Donald Trump hovers next to the statue of former Prime Minister Winston Churchill
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Donald Trump UK visit: protests, placards and putting First Lady, Melania Trump, accompanied by Philip May, meets schoolchildren and British Army veterans
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Donald Trump UK visit: protests, placards and putting A lookalike of former British Foreign Minister Boris Johnson stands next to a person in a cage wearing a money suit and a mask of Donald Trump
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Donald Trump UK visit: protests, placards and putting Donald Trump gestures as he prepares to board Marine One to depart the US ambassador's residence Winfield House
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Donald Trump UK visit: protests, placards and putting Demonstrators stand in front of a blimp portraying US. President Donald Trump, in Parliament Square
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Donald Trump UK visit: protests, placards and putting The Prime Minister hosts President Trump and First Lady Melania at a black tie dinner with business leaders at Blenheim Palace
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Donald Trump UK visit: protests, placards and putting The Prime Minister, accompanied by husband Philip, arrive with President Trump and First Lady Melania to a black tie dinner with business leaders at Blenheim Palace
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Donald Trump UK visit: protests, placards and putting The Prime Minister and President Trump are seen holding hands, not for the first time
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Donald Trump UK visit: protests, placards and putting President Donald Trump pumps his fist during his arrival, with first lady Melania Trump, in Regent's Park
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Donald Trump UK visit: protests, placards and putting Demonstrators bang pots and pans as they gather at the US ambassador residence in Regent's Park
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Donald Trump UK visit: protests, placards and putting US President Donald Trump and US First Lady Melania Trump walk in the grounds of the US ambassador's residence Winfield House
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Donald Trump UK visit: protests, placards and putting A demonstrator protests next to the specially erected fence surrounding the US ambassador's residence
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Donald Trump UK visit: protests, placards and putting A motorcade arrives at Winfield House in London, the residence of American Ambassador to the to the Court of St James's
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Donald Trump UK visit: protests, placards and putting A presidential helicopter lands in the grounds of the US ambassador residence in Regent's Park
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Donald Trump UK visit: protests, placards and putting Protesters chant and wave placards during a demonstration outside Winfield House
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Donald Trump UK visit: protests, placards and putting he Marine One helicopter carrying US President Donald Trump and First Lady Melania Trump flies past the BT Tower
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Donald Trump UK visit: protests, placards and putting Protesters chant and wave placards during a demonstration outside Winfield House
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Donald Trump UK visit: protests, placards and putting US President Donald Trump and First Lady Melania Trump disembark from Air Force One after arriving in the UK
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Donald Trump UK visit: protests, placards and putting US First Lady Melania Trump and US President Donald Trump are greeted by US Ambassador to the United Kingdom Woody Johnson
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Donald Trump UK visit: protests, placards and putting US President Trump and Melania Trump leaving Stansted Airport
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Donald Trump UK visit: protests, placards and putting An honour guard stands to receive US President Donald Trump and US First Lady Melania Trump
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Donald Trump UK visit: protests, placards and putting Donald and Melania
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Donald Trump UK visit: protests, placards and putting US President Donald Trump and First Lady Melania Trump greet Secretary of State for International Trade Liam Fox on their arrival
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Donald Trump UK visit: protests, placards and putting US Marine Corps Osprey aircraft taking off
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Donald Trump UK visit: protests, placards and putting Us President Donald Trump and First Lady Melania Trump disembark from Air Force One
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Donald Trump UK visit: protests, placards and putting US President Trump and Melania Trump arrive at Stansted
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Donald Trump UK visit: protests, placards and putting A giant 'Human Rights Nightmare' banner is unfurled by Amnesty International activists across the river Thames on Vauxhall Bridge to protest against the visit of US President Donald Trump
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Donald Trump UK visit: protests, placards and putting US President Donald Trump waves as he arrives in the UK
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Donald Trump UK visit: protests, placards and putting An armed police officier waits on the tarmac at Stansted Airport
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Donald Trump UK visit: protests, placards and putting US President Donald Trump and Melania Trump arrive at Stansted Airport
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Donald Trump UK visit: protests, placards and putting Armed police await the arrival of US President Donald Trump at Stansted Airport
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“I was very saddened to see he was leaving government and I hope he goes back in at some point. I think he is a great representative for your country.”
In a wide-ranging interview the US president also took aim at Sadiq Khan, the mayor of London, who has long been a critic of Mr Trump.
He blamed the mayor for feeling "unwelcome" in the UK, in light of mass street protests and said he "used to love London".
Mr Trump also added that he believed Mr Khan was responsible for the terror attacks that had taken place in the capital, saying that he had "done a very bad job on terrorism" as well as a "bad job on crime".
“I think allowing millions and millions of people to come into Europe is very, very sad," he told the paper.
“I look at cities in Europe, and I can be specific if you’d like. You have a mayor who has done a terrible job in London. He has done a terrible job."
Mr Trump went further and claimed and that the UK and the rest of Europe was "losing its culture" because of immigration.
"Allowing the immigration to take place in Europe is a shame," he said.
“I think it changed the fabric of Europe and, unless you act very quickly, it’s never going to be what it was and I don’t mean that in a positive way.
“So I think allowing millions and millions of people to come into Europe is very, very sad.
“I think you are losing your culture. Look around. You go through certain areas that didn’t exist ten or 15 years ago.”
On Thursday evening as the comments were made public, Mr Trump attended a lavish black tie welcome dinner at Blenheim Palace hosted by Ms May.
On Friday, Mr Trump will meet Ms May again to watch a special forces demonstration at a secret location in the English countryside, before they travel together to Chequers for “substantive bilateral talks” on foreign policy issues.
Following a joint press conference Mr Trump will meet the Queen at Windsor Castle.
He will then fly to Scotland, where he is expected to spend the weekend playing golf before departing on Sunday.
Mr Trump's visit is set to be met by tens of thousands of protesters in central London, with a giant inflatable “Trump baby” set to be tethered near Parliament Square, depicting the president in a nappy.
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