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Donald Trump mimicked Barack Obama as he left the White House to be inaugurated 45th president of the United States.
Walking side-by-side, the pair greeted senior Democrats and Republicans and journalists before they made their way to Capitol Hill.
The outgoing President waved and said clearly to the cameras: “Hello everybody.”
Mr Trump followed Mr Obama by repeating the same phrase.
U.S. President-elect Donald Trump (Getty Images) Follow live updates from in inauguration here .
The exchange sparked a reaction on Twitter, with one person joking: “If we're lucky, he'll just do that for 4 years.”
Another wrote: “Imitation is the highest form of flattery.”
Minutes later, Mr Trump gave a thumbs-up, pumped his fist and mouthed "thank you" as he walked to his seat on the steps of the Capitol, next to incoming Vice President Mike Pence.
Show all 14 1 /14Trump Inauguration protests around the World Trump Inauguration protests around the World Activists from Greenpeace display a message reading "Mr President, walls divide. Build Bridges!" along the Berlin wall in Berlin on January 20, 2017 to coincide with the inauguration of Donald Trump as the 45th president of the United State
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Trump Inauguration protests around the World An activist holds up a sign at the "We Stand United" rally on the eve of US President-elect Donald Trump's inauguration outside Trump International Hotel and Tower in New York on January 19, 2017 in New York
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Trump Inauguration protests around the World Protesters burn a U.S. flag and a mock flag with pictures of U.S. President-elect Donald Trump outside the U.S. embassy in metro Manila, Philippines
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Trump Inauguration protests around the World Filipino protestors hold placcards during a protest rally in front of the US embassy in Manila, Philippines, 20 January 2017. On the eve of President-elect Donald Trump's inaguration as the 45th president of the United States, Filipinos and Fil-Americans held a protest in front of the US embassy in Manila to denounce the incoming US president.
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Trump Inauguration protests around the World Hong Kong police officers and security guards look on as an anarchist protester belonging to the Disrupt J20 movement sits after using a heavy duty D-lock and motorcycle lock to chain himself to a railing at the entrance gate to the Consulate General of the United States of America in Hong Kong to protest the inauguration of United States President-elect Donald Trump, Hong Kong, China, 20 January 2017. Two activists were arrested and taken away by Hong Kong police during the demonstration.
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Trump Inauguration protests around the World A banner is unfurled on London's Tower Bridge, organised by Bridges Not Walls - a partnership between grassroots activists and campaigners working on a range of issues, formed in the wake of Donald Trump's election, which aims to build bridges to a world free from hatred and oppression.
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Trump Inauguration protests around the World Protesters chain themselves to an entry point prior at the inauguration of U.S. President-elect Donald Trump in Washington, DC, U.S.
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Trump Inauguration protests around the World Bridges Not Walls banner dropped from Molenbeek bridge in Brussels, Belgium, 20 January 2017, in an Greenpeace action part of protests Wolrd protest in solidarity with people in the US, the day Donald Trump sworn in as the 45th President of the United States.
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Trump Inauguration protests around the World A woman holds an anti-U.S. President-elect Donald Trump placard during a rally in Tokyo, Japan,
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Trump Inauguration protests around the World A Palestinian protester holds a placard during a demonstration against the construction of Jewish settlements in the occupied West Bank and against US President-elect Donald Trump, on January 20, 2017, near the settlement of Maale Adumim, east of Jerusalem
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Trump Inauguration protests around the World Banners on North Bridge in Edinburgh as part of the Bridges Not Walls protest against US President Donald Trump on the day of his inauguration
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Trump Inauguration protests around the World Russian artist Vasily Slonov (L) and his assistant carry a life-sized cutout, which is an artwork created by Slonov and titled "Siberian Inauguration", before its presentation on the occasion of the inauguration of U.S. President-elect Donald Trump, in a street in Krasnoyarsk, Russia
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Trump Inauguration protests around the World A woman holds a banner during a march to thank outgoing President Barack Obama and reject US President-elect Donald Trump before his inauguration at a park in Tokyo, Japan, 20 January 2017.
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Trump Inauguration protests around the World Palestinian demonstrators protesting this week against a promise by Donald Trump to re-locate the US embassy to Jerusalem
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Ahead of the swearing-in ceremony, Mr Trump and his wife Melania were greeted at the White House by President Obama and Michelle Obama for the traditional private meeting of outgoing and incoming presidents and their spouses.
Posing for photos on the North Portico, the couples exchanged hugs.
After taking the oath, Mr Trump will go to a celebratory lunch with lawmakers and parade up Pennsylvania Avenue, passing his newly opened Washington hotel.
Meanwhile, workers at the White House will begin to move out the Obamas and prepare for its new occupants.
Moving trucks were on standby on Friday morning at the White House.
Mr Obama will continue to live in Washington but will first go to California with his family for a holiday in Palm Springs.
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