Biden and Vice President-elect Harris will travel to Georgia to campaign on behalf of Democratic Senate candidates Jon Ossoff and Raphael Warnock starting this weekend.

Harris will be in Savannah on Sunday and Biden will visit Atlanta on Monday, the eve of the Tuesday runoff elections that will determine which party controls the Senate.

This is Biden and Harris’ second trip to Georgia ahead of the runoff. Biden will also be in the Peach State at the same time as Trump, who will be holding a rally on the same day to support Republican candidates Sens. Kelly Loeffler and David Perdue.

-ABC News' Molly Nagle

Just 16 days before he's set to leave office, President Donald Trump will headline a rally for Sens. Kelly Loeffler and David Perdue in Dalton, Georgia.

The rally comes on Jan. 4, the night before the two sitting senators face separate Democratic opponents -- Rev. Raphael Warnock and Jon Ossoff, respectively -- in two runoffs that could determine control of the Senate. The makeup of the Senate is currently projected to be 50 Republicans and 48 Democrats and left-leaning independents. If Warnock and Ossoff win, pushing the balance to 50-50, the Democrats would control both the House and Senate, due to Kamala Harris casting the deciding vote in the upper chamber.

Dalton is in Georgia's 14th Congressional District, which makes up the northwest corner of the state and is perhaps the state's most conservative district. Its congresswoman-elect, Marjorie Taylor Greene, has supported QAnon conspiracies in the past and has fully embraced, defended and perpetuated Trump's false narrative about the election.

The 14th Congressional District is also doing the worst of the 14 districts in terms of turnout for the runoff, according to Georgia Votes, which is analyzing the secretary of state's data.

Trump made his one and only appearance in Georgia during the runoff campaign on Dec. 5, when he spent nearly two hours ticking off baseless conspiracies about the presidential election and went on a tangent about how he didn't want to come to appear at the rally.

-ABC News' Quinn Scanlan

Continuing Biden and Vice President-elect Kamala Harris' focus on the worsening coronavirus pandemic Tuesday, the transition team announced nine additional members of the White House COVID-19 response team.

The new members will help focus on the "three crucial aspects of the COVID-19 response strategy: supply chain management, vaccinations, and testing," the transition team said.

"To recover from this pandemic, we must take aggressive action to manufacture, distribute, and administer vaccines, testing, and personal protective equipment in an equitable way. These individuals are deeply qualified and will restore public trust in the pandemic response by leading with facts, science, and integrity,” Biden said in a statement announcing the new members.

-ABC News' Beatrice Peterson

Following a meeting with his COVID-19 task force, Biden delivered remarks on the state of the worsening coronavirus pandemic and slammed the Trump administration for falling behind its goal in distributing vaccines to Americans.

"As I long feared and warned, the effort to distribute and administer the vaccine is not progressing as it should," Biden said. "If it continues to move as it is now, it's going to take years, not months, to vaccinate the American people."

The president-elected noted how officials working on "Operation Warp Speed," the federal government's vaccine program, had predicted this month 20 million vaccinations by the end of the year, but with just a few days left in 2020, the Centers for Disease Control has recorded about 2.1 million Americans as having received a dose.

"This will take more time than anyone would like and more time than the promises from the Trump administration have suggested. This is going to be the greatest operational challenge we've ever faced as a nation," Biden said. "And we're going to get it done."

Biden repeated his intention to invoke the Defense Production Act to compel companies in the private sector to accelerate the production of materials needed for vaccines and testing, as well as protective gear. He also announced that his administration will launch a public education campaign to promote vaccine acceptance and equity.

"We're also going to make sure vaccines are distributed equitably, so every person who wants a vaccine can get it no matter the color of their skin or where they live. We're going to ensure vaccinations are free of charge," he said.

Biden, overall, painted a bleak picture of soaring infections and deaths in the coming weeks, acknowledging the "grim milestone" of the U.S. crossing 330,000 deaths and saying the county may not see improvement until March. He implored Americans to wear a mask and social distance in the meantime -- and called on Trump to set an example.

"It would make a huge difference for President Trump to say 'wear masks.' I hope the President will clearly and unambiguously urge all Americans to take the vaccine once it's available," he said.

There was more drama Thursday over an attempt to have the Senate vote on House-passed legislation that would send qualifying Americans $2,000 stimulus payments.

Once again, Senate Majority Leader Mitch McConnell quashed an attempt -- this one by Sens. Chuck Schumer, D-N.Y. and Bernie Sanders, I-Vt. -- to call up and vote on the House-passed legislation.

McConnell claimed House Speaker Nany Pelosi and Sanders (the lead sponsor of the House-passed bill in the Senate) were supporting "socialism for the rich" after experts calculated that higher-income earners (up to $350,000 a year) would stand to get some federal relief under the House-passed plan. But the Republican leader made no mention of Trump or Sen. Josh Hawley, R-Mo., also calling for those higher payments.

Schumer fired back, saying he never heard Republicans complain about "socialism for the rich" when they were giving big corporate tax breaks.

Sanders, in his retort, was ready with stats from McConnell's home state, noting that "more than 22% of children" live in poverty and thousands of workers earn sparse wages, saying that "someone should ask them" what they would do with $2,000 payments.

"All I am asking Senator McConnell is give us a vote!" Sanders said. "Give us a vote! What is the problem? What is the problem with having the American people see how their senators vote.”

-ABC News’ Trish Turner