on Tuesday, promising a crackdown on illegal immigration and portraying himself as a saviour chosen by God to rescue a faltering nation.
Here's a look at Trump's second inauguration day in pictures.
Around 20,000 people packed the Washington DC's Capital One sports arena to watch the swearing-in on the facility's enormous screens — a makeshift solution — with Donald Trump promising to appear there in person for a "presidential parade" scheduled for later in the day. Source: EPA / Allison Dinner
Glacial temperatures forced Donald Trump's inauguration indoors on Tuesday, leaving a crowd of just a few hundred supporters on the National Mall where normally there would have been hundreds of thousands witnessing the ceremony unfold. Source: EPA / Anna Rose Layden
(left to right) First lady Jill Biden, President Joe Biden, Vice President Kamala Harris and Second Gentleman Doug Emhoff greeted Donald Trump and his family at the White House ahead of the swearing-in ceremony. Source: SIPA USA / Will Oliver
Tech billionaires including Jeff Bezos, Sundar Pichai and Elon Musk had prominent seats on the stage inside the Rotunda of the US Capitol, next to cabinet nominees and members of Donald Trump's family. Source: AAP
Country star Carrie Underwood performed "America the Beautiful" during the swearing-in ceremony. A pre-inauguration rally on Monday included performances by Kid Rock as well as the Village People. Source: SIPA USA
Melania Trump's wide-brimmed hat shielded her eyes in most photos from the inauguration and hindered her commander-in-chief husband's attempts to give her a peck on the cheek before his swearing-in. Source: AAP / Chip Somodevilla
The hat was designed by New York milliner Eric Javits. Source: AAP
The ceremony was moved inside the Capitol due to the freezing weather. It's the first time the emergency measure has been taken since the 1985 inauguration of Ronald Reagan, also due to dangerously cold weather. Source: AAP / CNP/ABACA
Donald Trump didn't place his hand on a bible or the US constitution as he took the presidential oath — either because he had decided to break with protocol or perhaps because he just forgot. The incoming first lady, Melania Trump, was standing beside him holding a Trump family bible and the so-called Lincoln Bible, which was used by the 16th president in 1861 and by Barack Obama in 2009 and 2013. Source: AAP
Former president George W Bush, former first lady Laura Bush and former president Barack Obama attended the ceremony. Former first lady Michelle Obama and former house speaker Nancy Pelosi missed the event. Source: AP / Saul Loeb
Donald Trump is just the second president in US history to return to power after being voted out, after Grover Cleveland in 1893. He is also the first convicted felon to become president after a New York jury found him guilty of falsifying business records to cover up hush money paid to a porn star during his first presidential run. Source: AAP / Morry Gash
