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Hope Hicks will return to the White House in a new role as counsellor to the president.
She will report to Jared Kushner , the president's son-in-law and senior adviser.
Ms Hicks, formerly the president's communications director, left the White House nearly two years ago.
A senior official told the New York Times that Ms Hicks' remit will include the re-election campaign and other projects that Mr Kushner oversees.
In a statement, Mr Kushner said: “There is no one more devoted to implementing President Trump’s agenda than Hope Hicks.”
Donald Trump celebrity president: A decade in two halvesShow all 29 1 /29Donald Trump celebrity president: A decade in two halves Donald Trump celebrity president: A decade in two halves Trump styles his 'You're fired!' pose in his Trump Tower office in June 2012. At the time he was known as a reality TV star on The Apprentice
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Donald Trump celebrity president: A decade in two halves He was also well known as the patron of the Miss Universe competition
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Donald Trump celebrity president: A decade in two halves Early signs of Trump's ambition for the presidency can be found everywhere. Not least in his 2011 book 'Time to get tough: Making America #1 again'
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Donald Trump celebrity president: A decade in two halves Trump with Piers Morgan in November 2010. Piers Morgan has long held that he and Trump are good friends
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Donald Trump celebrity president: A decade in two halves Trump appeared on Fox & Friends, his favourite show, in August 2011
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Donald Trump celebrity president: A decade in two halves Trump considered running in the 2012 election, where he would have faced Barack Obama. He is speaking here at an event for a Republican women's group
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Donald Trump celebrity president: A decade in two halves Trump was subject to a Comedy Central roast in 2011. He is pictured here being roasted by rapper Snoop Dogg
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Donald Trump celebrity president: A decade in two halves Given that this Trump store is in the lobby of Trump Tower, it can be said that Trump sells merchandise of himself out of his own home
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Donald Trump celebrity president: A decade in two halves Trump held meetings with prominent Republicans when considering his 2012 bid. He is pictured here with Alaska governor Sarah Palin
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Donald Trump celebrity president: A decade in two halves He didn't end up running in 2012 afterall, instead endorsing Republican candidate Mitt Romney
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Donald Trump celebrity president: A decade in two halves Trump's golf course in Aberdeen proved controversial in 2012 when he began lobbying the Scottish government against wind power in order that they wouldn't install turbines off the shore by his new course
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Donald Trump celebrity president: A decade in two halves He even gave evidence to a Scottish parliamentary committee discouraging wind energy
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Donald Trump celebrity president: A decade in two halves He still found time for a round of course
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Donald Trump celebrity president: A decade in two halves On 16 June 2015, Trump announced that he would run for the presidency of the United States in the 2016 election as a Republican
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Donald Trump celebrity president: A decade in two halves His campaign was divisive, courting controversy wherever he went. Ultimately he was declared the Republican candidate in June 2016
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Donald Trump celebrity president: A decade in two halves Trump took part in the TV debate against opponent Hillary Clinton on 9 October
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Donald Trump celebrity president: A decade in two halves Trump and wife Melania vote in the presidential election on 8 November 2016
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Donald Trump celebrity president: A decade in two halves Hillary Clinton conceded defeat at 2:50am on 9 November and president-elect Trump swiftly delivered his victory speech to a crowd of supporters
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Donald Trump celebrity president: A decade in two halves News coverage around the world focused on the huge political upset that Trump's victory spelled
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Donald Trump celebrity president: A decade in two halves Trump met with president Obama to discusss transition planning on 10 November.
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Donald Trump celebrity president: A decade in two halves Donald Trump and Nigel Farage pose in the golden elevator at Trump Tower on 12 November 2016. Farage was the first British politician to meet with Trump after the election
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Donald Trump celebrity president: A decade in two halves The inauguration of Donald Trump took place on 20 January 2017. Trump's press secretary Sean Spicer boasted that the crowd was the 'largest ever' to witness an inauguration, a claim that was proved not to be true
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Donald Trump celebrity president: A decade in two halves In his first 100 days as leader, Trump signed 24 executve orders, the most of any president
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Donald Trump celebrity president: A decade in two halves One of Trump's most memorable election pledges was to build a wall between the US and Mexico. He is standing here in front of a prototype for a section of the wall
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Donald Trump celebrity president: A decade in two halves Trump's meetings with other world leaders have provided no short supply of photo opportunities
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Donald Trump celebrity president: A decade in two halves Trump was welcomed to the UK by the Queen and a state banquet was held at Buckingham Palace in his honour
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Donald Trump celebrity president: A decade in two halves Not everyone welcomed the president. Mass protests were held in London throughout his visits in both 2018 and 2019
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Donald Trump celebrity president: A decade in two halves One of the most significant meetings Trump has held with another leader was with North Korea's Kim Jong Un. In June 2019, Trump became the first sitting president to set foot in North Korea
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Donald Trump celebrity president: A decade in two halves 2020 will see president Trump fight for a second term in office, who knows what the next decade will bring?
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“We are excited to have her back on the team.”
Ms Hicks originally worked for Ivanka Trump's fashion brand, before becoming an employee of Mr Trump in 2014.
She joined the 2016 presidential campaign in its infancy and was constantly by candidate Trump's side She was named as press secretary and then communications director.
After the election she became the national press secretary for the presidential transition team, moving to Washington from New York to take up a role in the West Wing.
She resigned from her position as communications director on 28 February, 2018, the day after she reportedly told the House Intelligence Committee that she was occasionally required to tell “white lies” as part of her job.
Following her departure from the White House, Ms Hicks joined Fox Corporation as chief communications officer and executive vice president.
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