Trump continues to discredit the voting system in Georgia, slamming GOP Gov. Brian Kemp and Secretary of State Brad Raffensperger -- and in doing so, risks undercutting GOP efforts there by discouraging Republican voters ahead of two runoffs on Jan. 5 that will determine the balance of power in the United States Senate.

Referring to Kemp as "hapless," Trump called on him via Twitter Monday morning to use his "emergency powers... to overrule his obstinate Secretary of State" and do signature matching for the absentee ballots again.

It’s unclear what emergency powers the president is referring to that the governor could execute, but signature matching for absentee ballots has already been conducted twice.

Signatures are matched first when a voter applied for an absentee ballot and then again when the voter returned their absentee ballot. Once the signature accompanying the returned ballot is verified, the ballots are separated from the envelopes and there is no way to re-match them because, under the Georgia state Constitution, a voter is entitled to a secret ballot. However, the envelopes are kept on file for two years.

It comes ahead of Trump traveling to Georgia on Saturday to campaign for the Republican candidates in the Senate runoffs.

-ABC News’ Quinn Scanlan

Biden is slated to receive his first President's Daily Brief Monday marking a milestone for the president-elect following a nearly three-week delay in the Trump administration recognizing him as the winner of the 2020 presidential election.

It comes after Biden, who has pressed forward with his transition despite Trump’s roadblocks, announced he’ll enter the White House with an all-female communications team and unveiled his economic team Monday morning, naming former Federal Reserve Chair Janet Yellen as his nominee for Treasury Secretary, the first woman to hold the top job if confirmed.

In another challenge to his transition, the president-elect fractured his right foot while playing with his dog, Major, over the weekend, and is expected to wear a walking boot for several weeks. 

Trump, meanwhile, isn’t acknowledging the loss even after appearing to come to terms with it on Thanksgiving and saying he would leave the White House if the Electoral College affirms Biden’s win. 

In a defiant interview with Fox Business Sunday, Trump fired off false claims to sow doubt in the electoral process and vowed to continue legal battles with his team on Monday targeting Arizona’s certification deadline. Trump’s personal attorney Rudy Giuliani and campaign adviser Jenna Ellis are expected to appear from D.C. at another non-official "hearing" of state GOP lawmakers at a Phoenix hotel Monday. 

The day also brings a certification deadline in Wisconsin, where a recount paid for by the Trump campaign wrapped over the weekend brought Biden 87 additional votes.

Biden has formally announced his economic team, including nominee Janet Yellen, who would be the first woman to lead the Treasury Department, and the first person to have served as Treasury Secretary, Chair of the Council of Economic Advisers and Chair of the Federal Reserve if confirmed.

Neera Tanden, nominated to to lead the Office of Management and Budget, would be the first woman of color in the role, if confirmed.

Here's a breakdown of the economic positions announced Monday:

The Biden transition is launching its Presidential Inaugural Committee, led by Tony Allen, president of Delaware State University, to organize activates around his swearing-in on Jan. 20. Several campaign officials including senior adviser Maju Varghese, national political director Eric Wilson and Nevada State Senator Yvanna Cancela, who also served as a senior adviser, will serve on the committee.

The team announced the following positions on Monday:

“This year's inauguration will look different amid the pandemic, but we will honor the American inaugural traditions and engage Americans across the country while keeping everybody healthy and safe," Allen said in a statement.

The committee says it will work with the Joint Congressional Committee on Inaugural Ceremonies (JCCIC) to prioritize keeping people safe in the pandemic while engaging the public in the historic event.

-ABC News' Molly Nagle