Thursday night, anti-Trump protesters clashed with police outside the National Press Club in Washington. Inside, a pre-inauguration event called the "Deploraball" was taking place.
Mike Pence is also being sworn in Friday as vice president. Pence has said he and Trump would be "ready to serve the American people on Day One."
The soon to be 45th president of the United States Donald Trump spent his last night as a private citizen at Blair House, the government's residence for dignitaries, directly across Pennsylvania Avenue from the White House.