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.

Kennedy Jr. as secretary of Health and Human Services. If the Senate confirms Kennedy, it will presage the biggest rethinking of the U.S. public health system ever. HHS and its agencies oversee drug approvals,

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.

Donald Trump returned to Washington on Wednesday as president-elect where he headed to the White House for the first time in four years

After his election win in 2016, Trump met with President Barack Obama in the Oval Office and called it “a great honor.” But he soon was back to heaping insults on Obama, including accusing his predecessor — without evidence — of having wire-tapped him during the 2016 campaign.

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

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

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).

WASHINGTON — Donald Trump has had few defenders in Congress as reliable as Matt Gaetz, who has thundered at one prosecutor after another for perceived bias against the president-elect and emphatically amplified the Republican's rallying cry that the criminal investigations into him are “witch hunts.”