Election 2024 updates: With Arizona, Trump sweeps all 7 swing states

The race for the House seat in Maine’s 2nd Congressional District will go to ranked-choice voting tabulation, the secretary of state's office announced Thursday. There will also be a potential recount, at the request of one of the candidates.

Incumbent Democrat Rep. Jared Golden was leading with 50.9% of the vote as of around 8:45 p.m. on Thursday, while his Republican opponent, Rep. Austin Theriault, followed with 49% of the vote. Less than 7,000 votes separated the two.

Maine uses ranked-choice voting in its federal races, so voters indicate their first, second and third choices, and so on. A candidate wins outright if they get over 50% of the vote initially.

If the race goes to ranked choice voting tabulation, the candidate with the fewest votes is eliminated and the votes from people who voted for that candidate are applied to their second choice. This continues until only two candidates are left; the leading candidate then wins.

Separately, Theriault's campaign announced Thursday plans to request a recount. According to the secretary of state's office, the recount would also use RCV tabulation.

-ABC News' Emily Chang and Oren Oppenheim

Rep. Elise Stefanik of New York is the leading candidate to serve as the ambassador to the United Nations under President-elect Donald Trump, according to multiple sources familiar with the matter.

While no decision has been made, Stefanik, who has emerged as one of Trump’s most fierce defenders in Congress, is likely to be vetted for the role, the sources said.

Stefanik in recent months has called for a "complete reassessment" of U.S. funding for the U.N. She had previously been on the early list of candidates Trump’s team had considered for vice president.

-ABC News’ Katherine Faulders, John Santucci and Will Steakin

There are "at least" 100,000 votes still outstanding in Pennsylvania amid a tight Senate race between incumbent Sen. Bob Casey and his Republican challenger David McCormick, Secretary of State Al Schmidt said Thursday night.

According to Schmidt, that count includes "provisional, military, overseas, and Election Day votes."

"We urge patience as election workers continue to do this important work, especially in contests where the margins are very close," he said.

-ABC News' Nicholas Kerr

Donald Trump announced he had selected his campaign manager, Susie Wiles, as his White House chief of staff, the president-elect said a statement Thursday.

“Susie Wiles just helped me achieve one of the greatest political victories in American history, and was an integral part of both my 2016 and 2020 successful campaigns,” Trump said.

“Susie is tough, smart, innovative, and is universally admired and respected. Susie will continue to work tirelessly to Make America Great Again," he added. "It is a well deserved honor to have Susie as the first-ever female Chief of Staff in United States history. I have no doubt that she will make our country proud."