Trump inauguration live updates: Donald Trump moves swiftly to implement his new agenda

Trump and Melania Trump walked into Capital One Arena together as "Hail to the Chief" was played by a military band.

The atmosphere is similar to that of Trump's campaign rallies, with attendees clad in red "Make America Great Again" hats.

Trump shook hands with supporters in the crowd, many of whom held up their cellphones to film his entrance.

Vance was accompanied by his family when they arrived at the inaugural parade.

Supporters have been there all day, watching video of the swearing-in and other events.

Sen. Amy Klobuchar, chair of the congressional inaugural committee, called into ABC News Live after the ceremonies on Capitol Hill.

Klobuchar was in the motorcade with Trump and Biden as they rode together from the White House to the swearing-in the Capitol Rotunda.

Klobuchar was in the motorcade with Trump and Biden as they rode together from the White House to the swearing-in the Capitol Rotunda.

"I'm not going to reveal every detail, except to say maybe we did discuss football just a little bit, and some of the games yesterday," she said about what was discussed on the short trip. "And we also talked about the now-president's upcoming trip to Los Angeles, and I talked to him privately about that with the Olympics coming, and how important that is."

MORE | What Trump and Biden discussed in the limo

Normally, the president and his entourage would walk down Pennsylvania Avenue to the White House after taking the oath of office.

But because of frigid temperatures in Washington, the events have been moved indoors to Capital One Arena.

The venue has the capacity to hold roughly 20,000 people. A desk has been set up on stage for Trump to sign some of the first executive orders of his administration.

Brian Driscoll has been named acting director of the FBI by the incoming administration, days after Driscoll was tapped as the new head of the FBI's Newark field office.

FBI Deputy Director Paul Abbate resigned this morning, as did most of the executive staff, according to sources.