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In Miami, Mr. Trump said about Dr. Anthony Fauci, the nation's leading infectious disease expert, "don't tell anybody but let me wait till a little bit after the election."
Historic voter turnout continues to grow.
The Supreme Court declined to expedite a ruling on a Pennsylvania court ruling extending the deadline for absentee ballots.
Tuesday marks one week before Election Day, as some form of voting is already underway in all 50 states.
Trump and Biden squared off on the economy, COVID-19, race, climate change and more.
A central figure has contradicted himself about his actions and motivations, raising questions about his account.
"I'm not a fan of court packing, but I don't want to get off on that whole issue. I want to keep focused," Biden said.
The Trump campaign argued Thursday night that the debate should proceed as planned on October 15.
The debate featured sharp exchanges over the coronavirus pandemic, the economy, the Supreme Court and more.
Dr. Sean Conley, the White House physician, said the president is doing "extremely well" and experiencing "no symptoms."
Trump took off his mask after he re-entered the White House, then tweeted a brief video in which he urged Americans not to let COVID-19 dominate them.
The president did a quick ride-around in a motorcade. His doctors said his condition was improving but revealed he got steroids recommended for very sick patients.
"It shouldn't be a surprise that the Senate is willing to push a president's nominee through in an election year when they share the same political affiliation," Barrett said.
"This election will decide whether we will defend the American way of life, or whether we allow a radical movement to completely dismantle and destroy it," the president said
"The choice in this election is whether America remains America," Pence said.