At noon today, Donald Trump takes the presidential oath for a second time, capping a historic political comeback to the White House. The ceremony has been moved inside to the U.S. Capitol Rotunda because of frigid weather for only the first time since Ronald Reagan's second inauguration 40 years ago.

President Donald Trump is spending his first full day back in the White House meeting with congressional leaders, announcing an investment in artificial intelligence infrastructure and demonstrating one of his favored expressions of power: firing people.

Donald and Melania Trump arrive at the White House ahead of the inauguration ceremony on Monday in Washington, D.C. (Andrew Harnik/Getty Images) Donald Trump was sworn in as the 47th president of the United States by Chief Justice John Roberts in an inauguration ceremony inside the Capitol Rotunda on Monday.