Trump-Biden transition updates: Trump continues to tout he won election at Ga. rally

At a Christmas party at the White House Tuesday night, President Donald Trump teased running for president again in 2024 while noting that he's still "trying to do another four years."

"It's been an amazing four years. We are trying to do another four years. Otherwise, I’ll see you in four years," the president can be heard saying on video of the event reviewed by ABC News.

Multiple sources also confirmed to ABC News that the president made the remarks at the White House party.

The president also falsely told the group of mostly Republican National Committee members gathered for the party that he won the election, calling it rigged and notably saying he will "always" call it rigged.

"It's certainly an unusual year. We won an election. But they don’t like that ... I call it a rigged election, and I always will," Trump said.

Since losing reelection, Trump has privately been telling advisers that he’s considering a 2024 campaign, as ABC News has previously reported.

The indoor party notably takes place as COVID-19 cases surge around the country and, according to the video, many people inside were not wearing masks despite the White House saying they would be mandatory.

Stephanie Grisham, the chief of staff and spokeswoman for the first lady, told ABC News in a statement on Nov. 22 that "masks will be required."

"The People’s House will celebrate Christmas and Hanukkah while providing the safest environment possible. This includes smaller guest lists, masks will be required and available, social distancing encouraged while on the White House grounds, and hand sanitizer stations throughout the State Floor," Grisham said. "Guests will enjoy food individually plated by chefs at plexiglass-protected food stations. All passed beverages will be covered. All service staff will wear masks and gloves to comply with food safety guidelines. Attending the parties will be a very personal choice. It is a longstanding tradition for people to visit and enjoy the cheer and iconic decor of the annual White House Christmas celebrations."

The Centers for Disease Control and Prevention have advised indoor holiday gatherings should be small and only include close family and friends who are part of your household.

Both the White House and the first lady's office declined to comment on the White House event.

--ABC News' Will Steakin, Katherine Faulders and Ben Gittleson

Gabriel Sterling, the statewide voting system implementation manager in Secretary of State Brad Raffensperger's office, unleashed on the president from Atlanta Tuesday afternoon, as well as GOP Sens. David Perdue and Kelly Loeffler, chastising them for not forcefully condemning threats of violence against election officials, making several direct pleas to Trump in his remarks. 

"Mr. President, it looks like you likely lost the state of Georgia. We're investigating, there's always a possibility, I get it, and you have the rights to go through the course. What you don't have the ability to do -- and need to step up and say this -- is stop inspiring people to commit potential acts of violence. Someone's gonna get hurt. Someone's gonna get shot. Someone's gonna get killed," Sterling said.

"Everything we're seeing right now, there's not a path. Be the bigger man here, and stop -- step in, tell your supporters, don't be violent, don't intimidate. All that's wrong. It's un-American," he continued.

Sterling said that Trump calling Georgia Secretary of State Brad Raffensperger "an enemy of the people" on Thanksgiving "helped opened the floodgates to this kind of crap."

"You have to be responsible in your rhetoric," he said. "That shouldn't be too much to ask for people who asked for us to give them responsibility." 

Explaining his anger, Sterling said that the "straw that broke the camel's back" was when someone took a video of a 20-year-old contractor working for Dominion in Gwinnett County claiming it showed him manipulating election data, but that was not was he was doing. He said the man is getting death threats -- that there's been "a noose put out saying he should be hung for treason" -- and since he has a unique name, people have tracked down his family, too and they're also being harassed. 

"Mr. President, you have not condemned these actions or this language. Senators, you have not condemned this language or these actions. This has to stop. We need you to step up, and if you're gonna take a position of leadership, show some," Sterling said. "All of you who’ve not said a damn word are complicit in this." br/>
-ABC News' Quinn Scanlan

Biden's team has made contact with two of most prominent leaders on the White House coronavirus task force -- Dr. Anthony Fauci, the nation’s top expert on infectious disease, and Dr. Deborah Birx, coronavirus response coordinator, as his transition team maintains its focus on the ongoing pandemic and the federal response they will inherit in 50 days.

Biden has held separate conversations with the two White House coronavirus task force officials, according to a transition official. Birx, whose colleagues told ABC News she would like to continue serving in a Biden administration, met with members of Biden's team on Monday.

A global health expert who was tapped from running the federal government’s program combating HIV/AIDS to serve on the task force in the February, Birx told CBS on Sunday that she was preparing to brief Biden's team on the nation's coronavirus response.

In an interview with McClatchy last week, Fauci said he assumes he will stay in his position as director of the National Institute of Allergy and Infectious Diseases, a post he has held for 36 years, but that he would also "seriously consider" serving in another capacity if Biden asked.

"I’m perfectly comfortable with the role that I’m in, but certainly if the president of the United States wants me to do something else, I’d seriously consider it," Fauci said. "Quite frankly, I don’t anticipate that I’m going to be doing anything other than what I’m doing now. But then again, we have a president-elect who may have other plans. I don’t know."

Ahead of Election Day, Biden promised he would "hire Fauci" and "fire Trump" if elected, amid Trump knocking Fauci's credibility and public health guidance.

-ABC News’ Benjamin Siegel and Ben Gittleson

Trump’s reelection campaign filed a petition to the Wisconsin Supreme Court on Tuesday, challenging the outcome of the presidential election that was certified on Monday with the president’s personal attorney, Rudy Giuliani, among those filing.

This latest petition alleges that poll workers illegally altered ballot envelopes, added missing information on voters’ behalf, counted ballots submitted early without sufficient voter identification, or collected ballots at unauthorized locations. In all, the Trump campaign claims that more than 211,000 votes were improperly counted. Trump lost the state to Biden by more than 20,600 votes.

Normally, this lawsuit would be filed with a circuit court but given the urgency the Trump campaign directly petitioned the state’s conservative-leaning high court. The court has not indicated if it will hear the case, or respond before the Dec. 8 “safe harbor” deadline, after which the election results are considered conclusive.

Democrats have not responded to the petition, but broadly have characterized the Trump campaign’s legal efforts as a “sideshow” that show no prospect of changing the outcome of the 2020 election. A series of court rulings to date have found no evidence of fraud or improper actions by elections officials in the states where the campaign has brought legal action.

-ABC News' Soo Rin Kim and Cheyenne Haslett