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Maj. Gen. John Andonie, the commanding general of the District of Columbia National Guard, told ABC News' MaryAlice Parks that he has "never felt more confident about" about the National Guard's security posture ahead of the big day.

The last-minute move inside the Capitol Rotunda is something that the National Guard members are adjusting to, but he added that their plan is still sound.

"We actually did rehearse several contingencies ... and that was just one of several contingencies we've been looking at. This is not a surprise," he said.

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-ABC News' MaryAlice Parks, Beatrice Peterson and Michelle Stoddart

The Special Air Mission plane carrying President-elect Donald Trump and his family has taken off from Florida and is en route to Washington, D.C., for the inauguration events.

He is expected to land at Washington Dulles International Airport later this evening.

Despite the last-second change of venue, Trump told ABC News' Rachel Scott the Big Tech CEOs he invited to the inauguration are "happier" about the change in plans because of the cold and said he expects all of them are still coming.

"We have almost 700 seats. It's not small by any means, but it's small by comparison to being outside," he said. "They're all coming. Every one is coming from the companies."

The Presidential Inauguration Security Team said Saturday that it has updated a lot of the security perimeter that was in place for the inauguration.

The focus will now be on the U.S. Capitol and Capital One Arena.

The screens on the mall have been removed, so there will be no way to view the swearing-in ceremony from the mall.

It also said there will be no parade on Pennsylvania Avenue. Rather, there will be a "standard motorcade" from Capital One Arena to the White House.

-ABC News' Luke Barr