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

As Biden takes the lead in the key battleground state of Pennsylvania, the Trump campaign issued a defiant statement making it clear that the president is not ready to concede.

"This election is not over," Matt Morgan, the Trump 2020 campaign general counsel, said in a statement Friday.

Morgan blasted what he called the "false projection of Joe Biden as the winner," which he said was "based on results in four states that are far from final."

Morgan also claimed that "Georgia is headed for a recount," alleging -- without evidence -- that "we will find ballots improperly harvested."

Meanwhile, Morgan claimed there were "many irregularities in Pennsylvania," but only provided one example of volunteer legal observers not "having meaningful access to vote counting locations."

Morgan also said "there appear to be thousands of individuals who improperly cast mail ballots" in Nevada -- a baseless claim for which the Trump campaign has provided no evidence.

"Biden is relying on these states for his phony claim on the White House," Morgan said, "but once the election is final, President Trump will be re-elected."

-ABC News' Will Steakin

Biden has pulled ahead in Pennsylvania, overtaking Trump's lead.

As of 8:50 a.m. ET Friday, Biden has 3,295,304 votes in the Keystone State -- 49.4% -- while Trump has 3,289,717 -- 49.3% -- with 95% of the expected vote reporting. That's a difference of 5,587 votes.

There are roughly 135,000 ballots left to be counted, according to the latest data from the Pennsylvania Department of State. State law mandates an automatic recount if the final margin is .5% or less of total votes cast.

Trump flipped the blue state red on his path to the White House in 2016. He won Pennsylvania's 20 Electoral College votes, defeating Hillary Clinton there by 44,292 ballots.

Before that year, Pennsylvania had voted for Democratic presidential candidates in six consecutive elections.

-ABC News' Adam Kelsey

Mail inspectors in Pennsylvania turned up more than 1,700 ballots at postal facilities across the state on Thursday, according to U.S. Postal Service data filed in court overnight.

The vast majority of those mail-in ballots were discovered in Democratic strongholds, nearly 1,400 of which are in Philadelphia and Pittsburgh. Mail inspectors found an additional 266 ballots in Pennsylvania's Lehigh Valley region.

Those votes, along with any additional ballots received before Friday afternoon, will be sequestered pending a Republican-led effort to have thrown them out.

Meanwhile, mail inspectors found more than 500 ballots in North Carolina following sweeps there.

These twice-daily sweeps were ordered Thursday morning by a federal judge in Washington, D.C., as part of a lawsuit brought by the NAACP against the U.S. Postal Service and its embattled leader, Postmaster General Louis DeJoy, claiming that a series of cost-cutting measures imposed at the mail agency over the summer threatened to disenfranchise people of color.

-ABC News' Lucien Bruggeman

Pennsylvania Lt. Gov. John Fetterman said he expects Biden to take the lead in his state soon, as ballots continue to be counted.

Trump currently holds an edge of about 16,000-18,000 votes, and there are "north of" 150,000-160,000 ballots left to be counted in the Keystone State, according to Fetterman, who noted that Pennsylvania's Republican-controlled state legislature did not allow local election officials to pre-canvas mail-in ballots before Election Day.

"Counting is ongoing and updates are going to be coming in, and I would expect the president's margin to evaporate shortly and go into the positive category for Vice President Biden," Fetterman told ABC News chief anchor George Stephanopoulos in an interview Friday on "Good Morning America."

Fetterman, a Democrat, called Trump's evidence-free claims of election fraud in Pennsylvania "lies" and "blatantly untrue." He said the election has run "smoothly" in his state and that the only evidence of fraud so far was a registered Republican in Luzerne County who tried to vote for his dead mother and has since been charged with voter fraud.

"The math that currently remains in front of us doesn't bode well for the president, and the closer it gets I think you're going to see more and more of that kind of incendiary misinformation," Fetterman said.