Photos: Donald Trump's Inauguration Day President Donald Trump, flanked by Vice President Mike Pence and Chief of Staff Reince Priebus, signs his first executive order on health care, Friday, January 20, in the Oval Office of the White House in Washington. Hide Caption 1 of 48

Photos: Donald Trump's Inauguration Day President Donald Trump smiles with his son Barron as they watch the 58th Presidential Inaugural Parade in Washington on Friday, January 20. Hide Caption 2 of 48

Photos: Donald Trump's Inauguration Day President Donald Trump salutes members of the New York Military Academy during the 58th Presidential Inaugural Parade on Friday, January 20. Hide Caption 3 of 48

Photos: Donald Trump's Inauguration Day President Donald Trump and Vice President Mike Pence salute military personnel from the main reviewing stand in front of the White House during the Presidential Inaugural Parade. Hide Caption 4 of 48

Photos: Donald Trump's Inauguration Day President Donald Trump steps out of his limousine in front of the Presidential Inaugural Parade reviewing stand on Pennsylvania Avenue on Friday, January 20. Hide Caption 5 of 48

Photos: Donald Trump's Inauguration Day Vice President Mike Pence, center, waves to supporters as he walks with his family during the Presidential Inaugural Parade. Hide Caption 6 of 48

Photos: Donald Trump's Inauguration Day Spectators watch from rooftops as President Donald Trump and first lady Melania Trump walk in the inaugural parade on Friday, January 20, in Washington. Hide Caption 7 of 48

Photos: Donald Trump's Inauguration Day President Donald Trump waves as he walks on Pennsylvania Avenue with first lady Melania Trump during the Presidential Inaugural Parade on Friday, January 20. Hide Caption 8 of 48

Photos: Donald Trump's Inauguration Day The U.S. Army Old Guard Fife and Drum Corps marches in the Presidential Inaugural Parade on Friday, January 20, in Washington. Hide Caption 9 of 48

Photos: Donald Trump's Inauguration Day Secret Service members surround the presidential limousine as it drives up Pennsylvania Avenue during the Presidential Inaugural Parade on Friday, January 20, in Washington. Hide Caption 10 of 48

Photos: Donald Trump's Inauguration Day Police escorts participate in the Presidential Inaugural Parade procession on January 20, in Washington. Hide Caption 11 of 48

Photos: Donald Trump's Inauguration Day From left, first lady Melania Trump, President Donald Trump, US Army Maj. Gen. Bradley Becker, Vice President Mike Pence and Karen Pence review the troops as part of the inaugural ceremonies. Hide Caption 12 of 48

Photos: Donald Trump's Inauguration Day Members of a military band line up prior to marching in the Presidential Inaugural Parade. Hide Caption 13 of 48

Photos: Donald Trump's Inauguration Day President Trump waves to Hillary Clinton, whom he defeated in the election, during his speech at the inaugural luncheon. He was sworn in as the 45th President of the United States on Friday, January 20. Hide Caption 14 of 48

Photos: Donald Trump's Inauguration Day Dignitaries bow their heads in prayer during the inaugural luncheon. Hide Caption 15 of 48

Photos: Donald Trump's Inauguration Day Newly sworn in President Trump shakes hands with Hillary Clinton. Hide Caption 16 of 48

Photos: Donald Trump's Inauguration Day President Trump is joined by the congressional leadership and his family as he formally signs his cabinet nominations into law. Hide Caption 17 of 48

Photos: Donald Trump's Inauguration Day Former President Barack Obama waves as he boards a Marine helicopter during a departure ceremony. Hide Caption 18 of 48

Photos: Donald Trump's Inauguration Day The Obamas and Trumps walk to Marine One after Donald Trump was sworn in as President. Hide Caption 19 of 48

Photos: Donald Trump's Inauguration Day President Trump delivers his inaugural address after being sworn in as the 45th President of the United States on Friday, January 20. Hide Caption 20 of 48

Photos: Donald Trump's Inauguration Day Trump is sworn in as President with his wife, Melania, at his side. Hide Caption 21 of 48

Photos: Donald Trump's Inauguration Day Supporters watch as Trump appears for his inauguration. Hide Caption 22 of 48

Photos: Donald Trump's Inauguration Day Vice President Mike Pence is sworn in by Justice Clarence Thomas as Pence's wife, Karen, holds the bible. Hide Caption 23 of 48

Photos: Donald Trump's Inauguration Day Trump arrives on the West Front of the Capitol to be sworn in. Hide Caption 24 of 48

Photos: Donald Trump's Inauguration Day President Barack Obama chats with Trump before the ceremony. Hide Caption 25 of 48

Photos: Donald Trump's Inauguration Day Trump arrives on the West Front of the Capitol. Hide Caption 26 of 48

Photos: Donald Trump's Inauguration Day Trump waits to step out onto the portico for his presidential inauguration. Hide Caption 27 of 48

Photos: Donald Trump's Inauguration Day Pence arrives at the Capitol for the inauguration. Hide Caption 28 of 48

Photos: Donald Trump's Inauguration Day Obama and Vice President Joe Biden arrive on the West Front of the Capitol. Senate Minority Leader Chuck Schumer and House Minority Leader Nancy Pelosi step before them. Hide Caption 29 of 48

Photos: Donald Trump's Inauguration Day Melania Trump arrives for the ceremony. Hide Caption 30 of 48

Photos: Donald Trump's Inauguration Day Former President Jimmy Carter, Rosalynn Carter, former President Bill Clinton, Hillary Clinton, former President George W. Bush and Laura Bush wait for the ceremony to begin. Hide Caption 31 of 48

Photos: Donald Trump's Inauguration Day Trump's children look for their seats before the ceremony begins. Hide Caption 32 of 48

Photos: Donald Trump's Inauguration Day Supreme Court justices await the ceremony. Front from left: Chief Justice John Roberts and Justices Anthony Kennedy and Clarence Thomas. Back from left: Justices Ruth Bader Ginsburg, Sonia Sotomayor, Stephen Breyer and Samuel Alito. Hide Caption 33 of 48

Photos: Donald Trump's Inauguration Day Crowds file in along the National Mall before Trump's swearing-in. Hide Caption 34 of 48

Photos: Donald Trump's Inauguration Day Former House Speakers Newt Gingrich and John Boehner arrive with their wives at the Capitol. Hide Caption 35 of 48

Photos: Donald Trump's Inauguration Day Former Vice President Dick Cheney arrives for the inauguration. Hide Caption 36 of 48

Photos: Donald Trump's Inauguration Day Sen. Ted Cruz arrives for the ceremony. Hide Caption 37 of 48

Photos: Donald Trump's Inauguration Day Sen. Bernie Sanders waves to the crowd from the West Front of the Capitol before the ceremony. Hide Caption 38 of 48

Photos: Donald Trump's Inauguration Day The presidential motorcade moves down Pennsylvania Avenue to the Capitol for the inauguration ceremony. Hide Caption 39 of 48

Photos: Donald Trump's Inauguration Day Former Vice President Dan Quayle and his wife, Marilyn, arrive for the ceremony. Hide Caption 40 of 48

Photos: Donald Trump's Inauguration Day The Obamas welcome the Trumps to the White House as they arrive for inauguration festivities Hide Caption 41 of 48

Photos: Donald Trump's Inauguration Day President Obama kisses the first lady as they await the arrival of President-elect Trump and his wife, Melania. Hide Caption 42 of 48

Photos: Donald Trump's Inauguration Day Pence arrives for a worship service at St. John's Episcopal Church across from the White House. Hide Caption 43 of 48

Photos: Donald Trump's Inauguration Day The Rev. Luis Leon greets the Trumps on their arrival for the service at St. John's. Hide Caption 44 of 48

Photos: Donald Trump's Inauguration Day The rain doesn't deter a crowd from gathering to watch the inauguration ceremony. Hide Caption 45 of 48

Photos: Donald Trump's Inauguration Day Workers dry seats on the West Front of the US Capitol. Hide Caption 46 of 48

Photos: Donald Trump's Inauguration Day Vice President Joe Biden and his wife, Jill, prepare to leave the White House for the final time. Hide Caption 47 of 48