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

Trump, surrounded by executive orders he planned to sign Monday evening, also signed an order pardoning approximately 1,500 Jan. 6 rioters.

The order also includes six commutations, he said.

"We hope they come out tonight. Frankly, they're expecting it," Trump told reporters.

As of early January, more than 1,580 individuals have been charged criminally in federal court in connection with Jan. 6, with over 1,000 pleading guilty, according to the Department of Justice.

Click here for a closer look at the sweeping pardons and commutations.

Elon Musk has been spotted at the White House West Wing, sources say.

Musk is said to have a blue badge -- which is essentially an all-access pass. Musk has office space in the Eisenhower Executive Office Building -- or the EEOB -- which is in the White House complex but situated next door.

Sources told ABC News that Musk is also likely to get West Wing office space.

Trump returned to the Oval Office to sign more executive orders at the Resolute desk, including one declaring a national emergency at the southern border.

Trump signed several executive orders before the cheering crowd, including freezing federal hiring except for the military and other excluded categories, requiring federal workers to return to full-time, in-person work immediately, restoring the freedom of speech and directing every federal department to address inflation.

The last order he signed in the arena, which directs the federal government to end the "weaponization of government against the political adversaries of the previous administration."

Trump tossed several pens into the crowd before leaving to head back to the Oval Office to sign more executive orders.