Republican Juan Ciscomani wins re-election to the U.S. House in Arizona's 6th congressional district, NBC News projects.

See the latest results here.

Ahead of the upcoming United Nations climate change conference in Azerbaijan, White House national climate adviser Ali Zaidi alongside John Podesta, who are both representing the U.S. at the summit, are hearing concerns from global leaders about Trump’s potential impact on climate progress. 

In a statement, outgoing Senate Minority Leader Mitch McConnell congratulated Thune, calling his election to be the next majority leader "well deserved."

“John Thune’s election is a clear endorsement of a consummate leader. The confidence our colleagues have placed in John’s legislative experience and political skill is well deserved," McConnell said.

“The American people elected Republicans to restore stability and order after four years of Washington Democrats’ failure," he added. "John Thune will take the reins with a tremendous opportunity to lead this transformation, and Senate Republicans stand behind him, ready to get to work.”

Republicans will maintain control of the House of Representatives by the thinnest of margins, NBC News projected Wednesday, handing President-elect Donald Trump and his party all the levers of power in Washington.

A Republican-controlled Congress will allow Trump to quickly fill out his Cabinet and other top administration roles and advance his agenda for at least the next two years. Last week, Republicans flipped three Democratic Senate seats to win control of the upper chamber.

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Standing alongside the new Republican leadership in the Senate, Thune said that his priority as leader will be to reverse actions done by current leader Chuck Schumer and President Biden.

"We will do the job that the founders intended us to do in the United States Senate and that the American people intend us to do. And that, right now, after this mandate election coming out of the American people, is to work with this president on an agenda that unwinds a lot of the damage of the Biden Harris Schumer agenda, and puts in place new policies that will move our country forward in a different direction," he said.

Senate Republicans have voted in their leadership lineup for the next Congress.

The new leaders starting in January will include John Thune, of South Dakota, as majority leader; John Barrasso, of Wyoming, as assistant majority leader; Tom Cotton, of Arkansas, as Republican Conference chair; Shelley Moore Capito, of West Virginia, as Republican Policy Committee chair; James Lankford, of Oklahoma, as Republican Conference vice chair; and Tim Scott, of South Carolina, National Republican Senatorial Committee chair.

Tech mogul Elon Musk and Rep. Matt Gaetz, R-Fla., both Trump allies, were waiting for the president-elect on his plane while he was at the White House meeting with Biden and have been chatting, a source on the plane said. 

After the House Republican Conference meeting at the Hyatt Regency in Washington, D.C., Musk, Gaetz and some staff peeled off and went straight to the plane to wait for Trump.

Israel says the former Arkansas Gov. Mike Huckabee, tapped by Trump to be the next U.S. ambassador to Israel, is a welcome choice. Meanwhile, the amount of aid flowing into Gaza is increasing but humanitarian organizations warn that parts of Gaza remain on the brink of famine. NBC’s Richard Engel reports for the "TODAY" show.

During a press briefing, White House Press Secretary Karine Jean-Pierre described Trump and Biden's two-hour meeting today as "substantive" and "an exchange of views."

She added that the two spoke about “important items on Congress’ to-do list for the lame duck session" and added that Biden "reiterated what he said to the president-elect the day after the election ... we will have an orderly transition and a peaceful transition of power."