Dr. Celine Gounder, a member of Biden’s COVID-19 task force, said Monday morning there is "no question" the country will see a post-holiday surge of coronavirus cases and, to help offset the worsening pandemic, confirmed Biden will invoke the Defense Production Act once in office to increase vaccine supply.

Gounder criticized the Trump administration for moving too slowly on vaccine distribution and said Biden will force manufacturers to step up by invoking the Defense Production Act, which gives the president the power to direct civilian businesses to help meet orders for products necessary for national defense.

“In the last two weeks, we basically averaged about a million doses of vaccine administered per week. We need to be getting to a million doses per day if we're going to reach the president-elect's target of 100 million doses in 100 days," Gounder said. She went on to explain that invoking the act is "to make sure that the personal protective equipment, the test capacity and the raw materials for the vaccines are produced in adequate supply so that those aren't limiting steps in all of this.”

Gounder also claimed the country will see "a major increase" in testing as well as in genetic surveillance to track new variants of the virus with the incoming administration.

-ABC News’ Brian Hartman

Trump is slated to return to Georgia in one week for a campaign rally on the eve of the Jan. 5 runoff races that are set to determine which party holds power in the U.S. Senate.

Sitting GOP Sens. Kelly Loeffler and David Perdue are facing off against Democratic contenders Rev. Raphael Warnock and Jon Ossoff, respectively, as early voting continues across the state Monday.

Earlier this month Trump stumped for Loeffler and Perdue at his first rally since the November election. There, he assaulted the integrity of Georgia's vote but encouraged GOP turnout in the wake of Biden becoming the first Democratic presidential candidate to win the state since 1992. Democrats are now hoping to cement its status as a swing state.

Biden, too, has stopped in Georgia since the presidential election to campaign for Warnock and Ossoff as the promise of passing the big ticket legislation he’s hoping for hangs on their races. If Democrats pick up both seats, Vice President-elect Kamala Harris will have the power to settle tie-breaker votes in Congress' upper chamber.

The Biden-Harris transition team has announced 12 new members of their incoming staff for the Office of Digital Strategy -- which the transition says will be a “robust” team in the Biden White House.

All 12 staffers announced Monday morning previously worked on the Biden-Harris campaign, which relied heavily on digital engagement amid the COVID-19 pandemic.

"With much of our lives online, it is critical for this administration’s digital efforts to be inclusive and extensive,” said Vice President-elect Kamala Harris in a joint statement announcing the picks.

-ABC News Molly Nagle

After days of opposition and hours before the federal government was going to shut down, Trump signed a $2.3 trillion bill into law Sunday night to avert a government shutdown and extend $900 billion in coronavirus pandemic relief -- but millions of American will be impacted by his delay.

Trump’s Sunday night signature came after two critical unemployment programs lapsed over the weekend, leaving roughly 14 million Americans who have relied on the income without a week of benefits during the holiday season. While the current bill shells out $600 direct payments for most Americans, Trump is breaking from his party by continuing his push to bring that amount to $2,000.

In a Sunday night statement announcing he had signed the bill, Trump -- who has sat on the sidelines of negotiations for months -- also called on Congress to make more revisions to cut down excess spending, saying "wasteful items need to be removed" from the bill and that he would send back a “redlined” version.

The move is forcing Senate Republicans, many who did not support more direct payments, to say whether they stand with Trump on increasing payments and revisiting the bill’s language or by their previous positions.

House Speaker Nancy Pelosi on Monday is bringing a vote on a stand-alone bill to increase economic impact payments to $2,000 to the House floor, and while it’s expected to pass the House, it’s unclear whether Senate Majority Leader Mitch McConnell will take up the measure in the Senate.

The president has no public events on his schedule as he continues his holiday from Mar-a-Lago, and threatens, via Twitter, a challenge to the counting of the Electoral College vote in Congress on Jan. 6.

Biden, meanwhile, is pressing forward with his transition with less than a month until his inauguration. The president-elect is slated to meet with members of his national security and foreign policy agency review teams on Monday and deliver afternoon remarks on their "findings and the key challenges his administration will inherit" from Wilmington, Delaware.

The House on Monday overwhelmingly voted to override Trump's veto of the must-pass sweeping defense policy bill known as the National Defense Authorization Act.

The final vote was 322-87, receiving the two-thirds majority it required. There were 109 Republicans who voted to override the veto and 20 Democrats voted to sustain it.

The Senate is expected to hold its own veto override vote later this week.

If the Senate also overrides the president's veto, it will be the first time Congress has successfully rejected a presidential veto during Trump's presidency.

Shortly before the vote, GOP Rep. Mac Thornberry of Texas, the ranking member of the House Armed Services Committee, urged his colleagues to vote for “the exact same bill” they did before, emphasizing that “not a comma has changed.”

“I would only ask that as members vote, they put the best interests of the country first,” Thornberry said. “There is no other consideration that should matter."

The bill initially cleared both chambers of Congress with veto-proof majorities earlier this month. Trump then officially vetoed the bill last week because it didn't include a repeal of Section 230, a law that shields internet companies from being liable for what is posted on their websites by them or third parties. The bill also included a provision that would rename military bases named after Confederates, which Trump opposed.

The $740 billion bill includes pay raises for America's soldiers, improvements in body armor for women, coronavirus relief, military housing improvements and boosted sexual harassment prevention and response measures, among other items. It has passed both chambers of Congress for 59 years straight with strong bipartisan support.

Some Republicans voted to sustain Trump’s veto despite supporting the bill earlier this month.

The defense bill must become law before noon Jan. 3, when the new session of Congress begins, or it will expire.

-ABC News' Mariam Khan