Donald Trump was sworn in on Friday as the 45th president of the United States. He took the oath of the office administered by Chief Justice John G. Roberts Jr. at the US Capitol with two Bibles – one used by President Abraham Lincoln at his first inauguration, the other gifted by Trump’s mother. /CFP Photo

Thousands of supporters lined up to watch the newly sworn-in President as he took part in the inaugural parade. /Reuters Photo

The Clintons remained grim-faced throughout the ceremony. /CFP Photo

Hillary Clinton eventually smiled as Trump led a standing ovation for his defeated rival, saying he was "honored" she and her husband had attended his inauguration. /Reuters Photo

Trump and the new First Lady Melania Trump accompanied former President Barack Obama and First Lady Michelle Obama to a helicopter heading for Andrews Air Force Base. /Reuters Photo

President Trump and Vice-President Mike Pence waved goodbye as the Bidens and Obamas left the Capitol. /Reuters Photo