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The former Imperial Wizard of the Ku Klux Klan tweeted “we did it” during Donald Trump’s inauguration.
David Duke , who served one term as the Louisiana State Representative, also “hailed” Mr Trump and praised him for “declaring war” on the “Jewish establishment”.
Mr Duke, who once led the neo-Nazi white-supremacist organisation, had endorsed Mr Trump from the start of the presidential campaign.
He had previously said Mr Trump’s presidency would be a “real opportunity” for white nationalists.
“If Trump does win, okay, it’s going to be a real opportunity for people like white nationalists, acting intelligently to build upon that,” Mr Duke said.
During the presidential campaign, Mr Trump hesitantly denounced Mr Duke and the KKK.
He described Mr Duke as a "bad person".
In pictures: Protests, pomp and Donald TrumpShow all 30 1 /30In pictures: Protests, pomp and Donald Trump In pictures: Protests, pomp and Donald Trump President-elect Donald Trump acknowledges guests as he arrives on the platform at the US Capitol in Washington DC
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In pictures: Protests, pomp and Donald Trump Donald Trump is sworn in as the 45th president of the United States by Chief Justice John Roberts as Melania Trump looks on during the 58th Presidential Inauguration at the U.S. Capitol in Washington
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In pictures: Protests, pomp and Donald Trump President Donald Trump shakes hands with Justice John Roberts after taking the oath at inauguration ceremonies swearing in Trump as the 45th president of the United States
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In pictures: Protests, pomp and Donald Trump President Donald Trump raises his fists after his inauguration on the West Front of the U.S. Capitol
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In pictures: Protests, pomp and Donald Trump U.S. President-elect Donald Trump greets outgoing President Barack Obama before Trump is inaugurated during ceremonies on the Capitol in Washington
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In pictures: Protests, pomp and Donald Trump resident-elect Donald Trump arrives on the platform of the US Capitol in Washington DC
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In pictures: Protests, pomp and Donald Trump Attendees partake in the inauguration ceremonies to swear in Donald Trump as the 45th president of the United States at the U.S. Capitol in Washington DC
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In pictures: Protests, pomp and Donald Trump US President Donald Trump delivers his inaugural address during ceremonies at the US Capitol in Washington DC
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In pictures: Protests, pomp and Donald Trump U.S. President Donald Trump waves with wife Melania during the Inaugural Parade in Washington DC
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In pictures: Protests, pomp and Donald Trump Protesters registered their rage against the new president Friday in a chaotic confrontation with police who used pepper spray and stun grenades in a melee just blocks from Donald Trump's inaugural parade route. Scores were arrested for trashing property and attacking officers
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In pictures: Protests, pomp and Donald Trump Demonstrators protest against US President Donald Trump in Washington DC
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In pictures: Protests, pomp and Donald Trump A woman holds a sign before the start of the Presidential Inauguration of Donald Trump at Freedom Plaza in Washington DC
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In pictures: Protests, pomp and Donald Trump Anti-Trump protesters prepare banners for a protest against the inauguration of US President-elect Donald Trump, in Berlin
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In pictures: Protests, pomp and Donald Trump Demonstrators shout slogans against US President-elect Donald Trump in Washington DC
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In pictures: Protests, pomp and Donald Trump Demonstrators march, block foot traffic and clash with U.S. Capitol Police at the entry checkpoints for the Inauguration of Donald Trump
Alamy Live News
In pictures: Protests, pomp and Donald Trump Demonstrators display a banner as people arrive for US President-elect Donald Trump's inauguration in Washington DC
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In pictures: Protests, pomp and Donald Trump A man displays a placard as people lineup to get into the National Mall for the inauguration of US President-elect Donald Trump in Washington DC
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In pictures: Protests, pomp and Donald Trump Protesters demonstrating against U.S. President Donald Trump raise their hands as they are surrounded by police on the sidelines of the inauguration in Washington DC
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In pictures: Protests, pomp and Donald Trump A demonstrator wearing a mask depicting Donald Trump protests outside the US Embassy in London
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In pictures: Protests, pomp and Donald Trump Demonstrators hold placards as they protest outside the US Embassy in London
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In pictures: Protests, pomp and Donald Trump Former US President George W. Bush and First Lady Laura Bush arrive for the Presidential Inauguration at the US Capitol
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In pictures: Protests, pomp and Donald Trump Michelle Obama and Dr. Jill Biden share an umbrella as President Donald Trump delivers his inaugural address at the inauguration in Washington DC
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In pictures: Protests, pomp and Donald Trump Former Democratic presidential nominee Hillary Clinton and former President Bill Clinton arrive on the West Front of the U.S. Capitol in Washington
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In pictures: Protests, pomp and Donald Trump U.S. Vice President Mike Pence takes the oath of office on the West Front of the U.S. Capitol in Washington, DC
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In pictures: Protests, pomp and Donald Trump Advisors to President-elect Donald Trump, Kellyanne Conway and Steve Bannon depart from services at St. John's Church during the Presidential Inauguration in Washington
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In pictures: Protests, pomp and Donald Trump Protesters demonstrating against U.S. President Donald Trump take cover as they are hit by pepper spray by police on the sidelines of the inauguration in Washington DC
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In pictures: Protests, pomp and Donald Trump An activist demonstrating against U.S. President Donald Trump is helped after being hit by pepper spray on the sidelines of the inauguration in Washington DC
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In pictures: Protests, pomp and Donald Trump A police officer tries to tackle a protester demonstrating against U.S. President Donald Trump
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In pictures: Protests, pomp and Donald Trump Police arrest and detain a protester in the street in Washington DC
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In pictures: Protests, pomp and Donald Trump A police officer falls to the ground as another shoots pepper spray at protesters demonstrating against U.S. President Donald Trump on the sidelines of the inauguration in Washington DC
Reuters
As Mr Trump was sworn in as US President masked protestors clashed with police.
Officials responded with tear gas, water cannons, pepper spray and stun grenades to control the demonstrations.
In his first speech as President, Mr Trump said power would be transferred from Washington to “the people”.
“We the citizens of America are now joined in a great national effort to rebuild our country and restore its promise for all of our people. Together we will determine the course of America and all of the world for many many years to come,” Mr Trump said.
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