Republicans have won full control of Washington, but Democrats will retain two key levers of power to shape legislative outcomes in Donald Trump’s second term.

Sylvester Stallone introduced Donald Trump during a Mar-a-Lago event Thursday evening, calling him the "second George Washington": "I'm in awe."

Trump was looming over the Senate majority leader three-way race. Musk and other Trump allies, including Tucker Carlson, backed Sen. Rick Scott (R-FL), who has close ties to the president-elect’s incoming chief of staff, Susie Wiles. Scott was an insurgent candidate facing Thune and John Cornyn of Texas.

The visit is a traditional part of the peaceful handoff of power — a ritual in which Trump himself declined to participate four years ago.

Donald Trump made a victor’s return to Washington Wednesday morning for the first time since winning the presidential election last week.

Republicans have secured their monopoly on power in Donald Trump’s new Washington, retaining their majority in the House of Representatives, CNN projected Wednesday, after picking up seats in California and Arizona and ushering in a dramatic new era of right-wing populist rule.

Returning lawmakers will be choosing the leaders for the next Congress and finishing work on the remaining priorities of the outgoing 118th Congress.

The FBI is offering a $25,000 reward for information on a suspect behind ballot box arsons in the Pacific Northwest ahead of the Nov. 5 election.

The FBI is offering up to $25,000 in exchange for information about the suspect they believe set fire to several ballot boxes in the Pacific Northwest during early voting last month.

With votes still being counted, here's a look at the key races that remain uncalled by the NBC News Decision Desk (read more on how those races are called on NBCNews.com).