Election 2020 updates: Biden warns of 'dark winter,' pushes masks in pandemic plan

During an appearance at his campaign headquarters Tuesday, the president continued to blast the Supreme Court decision that allows Pennsylvania to count ballots that were postmarked by today until Friday. 

“I think the ruling on Pennsylvania was an unfortunate one by the Supreme Court because I think we should know what happens on the night,” he said. “Let people put their ballots in earlier, but you have to have -- you have to have numbers. You can’t have these things delayed for many days and maybe weeks. You can’t do that. The whole world is waiting.” 

“And a lot of shenanigans, a lot of bad things happen with ballots when you say, ‘Oh, let's devote days and days,’ and, all of a sudden, the ballot count changes,” he added. 

He called the Supreme Court ruling, “a very dangerous decision for this country.” 

“You have to have a date. And the date happens to be November 3rd,” he said. “And we should be entitled to know who won on November 3rd.”

- ABC News’ Terrance Smith and Elizabeth Thomas.

Kamala Harris briefly spoke with reporters as she arrived in Detroit, Michigan, for her Election Day visit.

She spoke about the significance of Michigan to the White House, saying the purpose of the trip was to ensure that Michigan voters felt seen and heard by the Democratic ticket. 

"The path to the White House and the path to determining who will be the next president of the United States, without question, runs through Michigan," she said. “So I’m just here to remind people of the Detroit that, that they are seen and heard by Joe and me and also that they may actually decide the outcome of this race."

Harris was asked what she would say to Americans nervous about the potential for civil unrest after the polls close. 

“Have faith in the American people,” she responded. “I do strongly believe that we, whoever you vote for, will defend the integrity of our democracy and a peaceful transfer of power.” 

Finally, Harris was also asked how she’s feeling about her and Joe Biden’s chances at winning.

“Listen, the day ain’t over,” she responded. “Ask me after the polls close. Maybe I’ll have a better idea, but right now, I’m just here to remind people to vote because the election is still happening right now. It’s not over.”

Harris is slated to make a couple of local stops in the Motor City before flying to Delaware for the campaign’s Election Night event. 

-ABC News’ Averi Harper.

After ten rallies in two days, President Donald Trump made a stop to his campaign headquarters in Arlington, Virginia, on Election Day to thank staffers for their hard work over the course of the campaign. 

In a video, staffers were seen in masks, yet senior adviser to the president Jared Kushner, Trump 2020 Campaign Manager Bill Stepien, White House press secretary Kayleigh McEnany and White House Chief of Staff Mark Meadows, who were all in attendance, did not wear masks.

When asked what his message was for Americans who didn’t vote for him if he wins tonight, Trump said that, “I think we’re set for tremendous success and success is going to bring unity.”

“Everybody should come together and I think success brings us together. We’re going to have a tremendous success,” the president said. “We had 33.1% up in growth, GDP, and nobody has ever seen a number like that.”

Trump hinted that he may give a speech this evening regardless of the outcome, saying, “we’re going to have to see.” 

The president, however, said he hasn’t thought about either a concession or acceptance speech adding, “winning is easy, losing is never easy.”

“I’m not thinking about concession speech or acceptance speech yet,” he said. “Hopefully, we'll be only doing one of those two.” 

- ABC News’ Terrance Smith and Elizabeth Thomas.

A federal judge has ordered the U.S. Postal Service to send inspectors to several processing facilities in key battleground states -- including Pennsylvania, Michigan and Florida -- to ensure that no mail-in ballot is left behind.

U.S. Judge Emmet Sullivan ruled Tuesday that the Postal Service must “sweep the facilities between 12:30 PM EST and 3:00 PM EST to ensure that no ballots have been held up and that any identified ballots are immediately sent out for delivery.”

Those inspectors are ordered to report back to the court by 4:30 p.m. ET “confirming, in the most efficient manner available, that sweeps were conducted and that no ballots were left behind,” Sullivan wrote.

The matter at hand is part of a lawsuit brought in August by the NAACP accusing the Postal Service and its leader, Postmaster General Louis DeJoy, of disenfranchising voters of color by implementing a set of cost-cutting initiatives that slowed mail service.

- ABC News’ Lucien Bruggeman.