HARRISBURG, Pa. (AP) — Pennsylvania had hundreds of thousands of ballots left to count Thursday, a number that state officials expected to dwindle rapidly as Democrat Joe Biden and Republican President Donald Trump fought to the end for the White House.

"It’s very close in Pennsylvania, there's no question," said the state's election's chief, Kathy Boockvar. “So that means it's going to take longer to actually see who the winner is.”

Some of the state’s most heavily populated locales, including Montgomery and Chester counties in the Philadelphia suburbs, reported finishing their tallies. The Trump campaign tried to stop the count in Philadelphia itself — alleging city officials were depriving their observers of meaningful access — but a federal judge refused to go along, instead urging the sides to forge an agreement. Speaking from the White House, Trump made unsupported allegations that Democrats in Pennsylvania and elsewhere were trying to steal the election.

Despite a flurry of legal action by Trump and the Republican Party over aspects of the count, counties across Pennsylvania headed toward the finish line of a massive tabulating effort that included millions of mail-in ballots. Pennsylvania remained the largest electoral prize yet to be called.

“We’re in a very good place with the mail-in and absentee ballots, but not quite there yet,” Boockvar, the secretary of state, said at a late-afternoon briefing. “What I've said all along is that the overwhelming majority of ballots will be counted by Friday. I still think we’re ahead of schedule.”

The Trump campaign and the Republican Party argued in court that GOP election observers were kept too far away from the tabulation in Philadelphia, that some Democratic-leaning counties unfairly allowed people to fix technical problems with their mail-in ballots, and that mail-in ballots arriving after Tuesday should not be counted.

His campaign scored one tentative legal victory as intermediate state appeals court on Thursday granted more access to party and candidate observers, allowing them to get closer — 6 feet (2 meters) away — to election workers processing mail-in ballots in Philadelphia.

The Trump campaign later filed an emergency action in federal court, asserting the city had failed to comply with the state court order. The campaign asked a federal judge to halt the count “so long as Republican observers are not present as required by state law.”

The city insisted it had moved barricades as ordered, even as it appealed the state court ruling to the Pennsylvania Supreme Court, citing concerns over worker safety amid the coronavirus pandemic and the potential for intimidation.

At an evening hearing, U.S. District Judge Paul S. Diamond, an appointee of former GOP President George W. Bush, told the Trump campaign and city officials to work it out. He expressed exasperation as lawyers bickered about which side was following the rules.

“Really, can’t we be responsible adults here and reach an agreement on how far all observers are allowed to stand?” said Diamond, suggesting each party be allowed 60 observers inside a hall at the downtown Philadelphia convention center where the ballots are being tallied.

“The whole thing could (soon) be moot," he said.

It was unclear whether any of the legal challenges would make a difference to an eventual outcome.

Bob Bauer, a Biden campaign adviser, said the Trump campaign lawsuits don’t have any merit and are designed to spread misinformation, disrupt vote counting and confuse the public.

“It is to create an opportunity to message falsely about what’s happening in the electoral process,” Bauer said.

Democratic Gov. Tom Wolf accused Republicans of seeking to undermine confidence in the election results, and Boockvar, the elections chief, said the state has acted legally and properly to ensure a complete and accurate count. More than 2.6 million mail-in ballots were cast, and there has been no report of fraud or any other problem with the accuracy of the count.

Allegheny County, where Pittsburgh is, wrapped up the initial vote count but had to wait until Friday to tabulate more than 35,000 mail-in and absentee votes. The delayed count of 29,000 of those votes stemmed from an earlier glitch involving voters who were initially mailed ballots with the wrong contests on them. The county issued corrected ballots but said it would review them to make sure they were counting only one ballot per voter.

Other ballots that will be reviewed include ones that couldn’t be scanned, or that were missing a date or had an illegible voter declaration, said county spokesperson Amie Downs.

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Rubinkam reported from northeastern Pennsylvania. Associated Press writers Marc Levy in Harrisburg and Maryclaire Dale in Philadelphia contributed to this report.

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Find AP’s full election coverage at APNews.com/Election2020.