Trump campaign distances itself from attorney Sidney Powell: Transition updates

Trump's top cyber official at the Department of Homeland Security, Chris Krebs, directly rebuked the president's claims of widespread voter fraud in a tweet Tuesday, citing 59 election security experts who agree election systems were not manipulated in the 2020 election. 

"ICYMI: On allegations that election systems were manipulated, 59 election security experts all agree, 'in every case of which we are aware, these claims either have been unsubstantiated or are technically incoherent,'" Krebssaid in a tweet with the hashtag "#Protect2020."

Krebs has reportedly told associates that he expects to be fired any day now by Trump. Last week Krebs took to Twitter to personally assure Americans the election was secure.

"America, we have confidence in the security of your vote, you should, too,” he tweeted at the time.

-ABC News' Mike Levine

Democratic Rep. Cedric Richmond of Louisiana officially announced his plans Tuesday to resign from Congress sometime before Inauguration Day so that he can take a senior adviser role in the incoming Biden-Harris administration. 

"The future has a habit of arriving unannounced, and I am here to announce the hardest decision of my life,” Richmond said at a press conference in New Orleans, as Biden separately announced that Richmond would serve as an assistant to the president and director of public engagement. 

The Louisiana congressman joined as the first co-chair of Biden's campaign in May 2019, advising on strategy and serving as a top surrogate, particularly on African American outreach for the former vice president's team. He has been serving in Congress since 2011. 

Richmond said he’s expecting an "orderly transition" despite the Trump administration's continued refusals to recognize Biden as the president-elect.

-ABC News' Mariam Khan

Rudy Giuliani, the president's personal attorney, has filed papers to appear on behalf of the Trump campaign in the federal election lawsuit filed in Pennsylvania.

The request follows the primary lawyer handling the case, Republican attorney Linda A. Kerns, submitting papers with the U.S. District Court Monday saying she had "reached a mutual agreement that Plaintiffs will be best served" if she withdrew.

She's the second lawyer helping lead Trump's effort to contest the outcome of the 2020 election who has asked to step aside, according to federal court filings.

The president installed Giuliani to lead legal efforts he has mounted to resuscitate his failed bid for a second term in office, a move that came after a series of defeats in court on Friday.

-ABC News' Matthew Mosk and Alex Hosenball

Vice President-elect Kamala Harris will join Biden’s transition briefing on national security remotely from Washington, D.C., according to an aide.

She joined Biden in-person at The Queen Theater in Wilmington, Delaware, on Monday for their first joint remarks on the economy since they were projected winners of the election. 

-ABC News’ Averi Harper