WASHINGTON (AP) — Democrat Joe Biden overtook President Donald Trump in the vote count in Pennsylvania and Georgia Friday morning, closing in on a presidency that hinges on the outcome of tight contests in key battleground states.

Both races remained too early to call with votes still being counted. Neither candidate has reached the 270 Electoral College votes needed to win the White House, though Biden has the advantage after eclipsing Trump in Wisconsin and Michigan, two crucial Midwestern battleground states. Biden leads Trump by nearly 6,000 votes in Pennsylvania and just over 1,000 in Georgia.

It could take several more days for the vote count to conclude in some states, allowing a clear winner to emerge. With millions of ballots yet to be tabulated, Biden has already received more than 73 million votes nationally, the most in history

As Americans entered the third full day after the election without knowing who won the race, anxiety about the outcome was building. With his pathway to reelection appearing to narrow, Trump was testing how far he could go in using the trappings of presidential power to undermine confidence in the vote.

On Thursday, he advanced unsupported accusations of voter fraud to falsely argue that his rival was trying to seize power in an extraordinary effort by a sitting American president to sow doubt about the democratic process.

“This is a case when they are trying to steal an election, they are trying to rig an election,” Trump said from the podium of the White House briefing room.

Biden spent Thursday trying to ease tensions and project a more traditional image of presidential leadership. After participating in a coronavirus briefing, he declared that “each ballot must be counted.”

“I ask everyone to stay calm. The process is working,” Biden said. “It is the will of the voters. No one, not anyone else who chooses the president of the United States of America.”

Trump showed no sign of giving up and was was back on Twitter around 2:30 a.m. Friday, insisting the “U.S. Supreme Court should decide!”

Trump’s erroneous claims about the integrity of the election challenged Republicans now faced with the choice of whether to break with a president who, though his grip on his office grew tenuous, commanded sky-high approval ratings from rank-and-file members of the GOP. That was especially true for those who are eyeing presidential runs of their own in 2024.

Maryland GOP Gov. Larry Hogan, a potential presidential hopeful who has often criticized Trump, said unequivocally: “There is no defense for the President’s comments tonight undermining our Democratic process. America is counting the votes, and we must respect the results as we always have before.”

But others who are rumored to be considering a White House run of their own in four years aligned themselves with the incumbent, including Sen. Josh Hawley, R-Mo., who tweeted support for Trump’s claims, writing that “If last 24 hours have made anything clear, it’s that we need new election integrity laws NOW.”

Trump’s campaign engaged in a flurry of legal activity to try to improve the Republican president’s chances, saying it would seek a recount in Wisconsin and filing lawsuits in Pennsylvania, Michigan and Georgia.

Judges in Georgia and Michigan quickly dismissed Trump campaign lawsuits there on Thursday, when Trump still held a small edge in Georgia — though Biden was gaining on him as votes continued to be counted. The same was true in Pennsylvania, where Trump’s lead had slipped to about 18,000 votes — and the race is destined to get tighter.

One reason is that elections officials were not allowed to process mail-in ballots until Election Day under state law. It’s a form of voting that has skewed heavily in Biden’s favor after Trump spent months claiming without proof that voting by mail would lead to widespread voter fraud.

Mail ballots from across the state were overwhelmingly breaking in Biden’s direction. A final vote total may not be clear for days because the use of mail-in ballots, which take more time to process, has surged as a result of the coronavirus pandemic.

The Trump campaign said it was confident the president would ultimately pull out a victory in Arizona, where votes were also still being counted, including in Maricopa County, the state’s most populous area. The AP has declared Biden the winner in Arizona and said Thursday that it was monitoring the vote count as it proceeded.

“The Associated Press continues to watch and analyze vote count results from Arizona as they come in,” said Sally Buzbee, AP’s executive editor. “We will follow the facts in all cases.”

Trump's campaign was lodging legal challenges in several states, though he faced long odds. He would have to win multiple suits in multiple states in order to stop vote counts, since more than one state was undeclared.

Some of the Trump team's lawsuits only demand better access for campaign observers to locations where ballots are being processed and counted. A judge in Georgia dismissed the campaign’s suit there less than 12 hours after it was filed. And a Michigan judge dismissed a Trump lawsuit over whether enough GOP challengers had access to handling of absentee ballots

Biden attorney Bob Bauer said the suits were legally “meritless.” Their only purpose, he said “is to create an opportunity for them to message falsely about what’s taking place in the electoral process.”

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Weissert reported from Wilmington, Delaware. Associated Press writers Colleen Long and Alexandra Jaffe in Washington contributed to this report.