Trump-Biden transition: Attorney Sidney Powell back at White House Sunday

The Warnock campaign released a trio of short digital ads in which former President Barack Obama urges voters to send Rev. Raphael Warnock to the Senate. 

One of the ads, titled "Act", pays homage to the late Georgia Congressman John Lewis. 

"John Lewis wrote that ‘Democracy is not a state. It is an act.’ Georgia, the time to act is now. Let’s send Raphael Warnock to the Senate to make progress for all of us," Obama says. 

The move to invoke Lewis's legacy in association with Warnock serves as a politically savvy way to counter the Loeffler campaign, which has labeled him a "radical." 

In another ad, Obama echoes the message delivered by Biden when he stumped for Democrats in Georgia, saying Warnock needs to be elected in order for the incoming president "to get things done."

The final ad captures a viral moment in which Obama was caught shooting a basket and casually joking, "That's what I do!"

"And voting? That’s something we do. If we want Joe Biden to succeed in tackling this virus and getting folks back to work, we need Raphael Warnock in the Senate," Obama says in the ad.

Early voting in Georgia for the Jan. 5 runoff races -- which will determine the balance of power in the U.S. Senate -- kicked off on Monday. Warnock is vying for Republican Sen. Kelly Loeffler's seat.

-ABC News' Alisa Wierseman

Acting Secretary of Defense Chris Miller is pushing back on the Axios report that there’s been a halt to transition meetings between the Pentagon and the Biden team.

“At no time has the Department cancelled or declined any interview,” Miller said in a statement Friday. “After the mutually-agreed upon holiday pause, which begins tomorrow, we will continue with the transition and rescheduled meetings from today.”

Miller said the Defense Department has supported 139 interviews sessions with more than 250 officials, complied with 161 requests for information and disclosed thousands of pages of non-public and classified documents, "exceeding prior transitions." 

-ABC News' Luis Martinez

Biden announced additional members of his White House communications and press shop on Friday, a slate of 16 names that include many people who served on the press team for his successful presidential campaign.

“Restoring faith in government by speaking honestly and directly to the American people will be a hallmark of my administration," Biden said in a statement announcing the hires.

-ABC News' John Verhovek

On the same day Vice President-elect Kamala Harris plans to visit Georgia to campaign for Democratic Senate candidates Jon Ossoff and Rev. Raphael Warnock, Ivanka Trump will be there to campaign for their GOP opponents, Sens. Kelly Loeffler and David Purdue, the Georgia GOP announced in a tweet.

“Excited to welcome @IvankaTrump to Georgia on Monday to campaign for @Perduesenate & @KLoeffler!” the party tweeted, sharing an article by Atlanta’s Fox station that says the president's daughter and adviser is scheduled to make three stops focusing on the Atlanta suburbs, including Milton, Suwanee and Walton County.

Both Republicans and Democrats have homed in on the runoff election as it will determine which party holds power in the U.S. Senate.

-ABC News' Ben Gittleson