PHILADELPHIA — Pennsylvania now stands to become ground zero in the movement to “audit” the election after former President Donald Trump’s efforts to discredit the 2020 election results appear to have failed in Arizona.

A monthslong partisan review in Arizona affirmed President Joe Biden’s victory there, according to draft reports made public late Thursday of the so-called “forensic audit” of the election results in Maricopa County, a linchpin county. That review had been widely criticized by experts for failing to follow best practices and was led by a company called Cyber Ninjas that had no previous experience with elections.

It remains to be seen how Pennsylvania Republicans will respond to the findings in Arizona, which were to be officially released later Friday. Lawmakers in Harrisburg have insisted their “forensic investigation” is different from Arizona’s. But the Republican leading the Pennsylvania probe, state Sen. Cris Dush, of Jefferson, traveled to Phoenix in June to tour the facility where the Cyber Ninjas team counted ballots and inspected machines.

Trump supporters were poised Friday to attack the findings, the media reports about it, or suggest that investigation wasn’t yet complete. But election experts said the developments in Arizona should serve as a warning to other states pursuing their own partisan reviews.

“It’s an unfortunate fact that after this abject failure in Arizona, after the embarrassment this biased and untransparent effort brought to the members of the Arizona Senate the pursued it, there are elected leaders in states including Pennsylvania, Wisconsin and now Texas, who are seeking to import this chaos to their states,” David Becker, founder of the nonprofit Center for Election Innovation & Research, said Friday.

Wisconsin Republicans have undertaken multiple reviews, including one led by a former conservative state Supreme Court justice, and the Texas secretary of state’s office announced its own “forensic audit” of four major counties.

Ben Ginsberg, a veteran GOP elections lawyer who served as counsel to George W. Bush and Mitt Romney’s presidential campaigns, said the Arizona review “was a designed process that gave the Trump forces everything they wanted” to investigate the election results.

“That means that if the Cyber Ninja report doesn’t produce solid, smoking gun, irrefutable evidence of a fraudulent election with evidence that stands up to scrutiny, means Trump and his allies fail,” Ginsberg told reporters Thursday. “ ... If Trump and his supporters can’t prove it here with the process they designed, then they can’t prove it anywhere.”

Biden won Pennsylvania by more than 80,000 votes, almost double the margin by which Trump carried the state in 2016. Extensive litigation and post-election audits turned up no evidence of widespread fraud.

Still, Pennsylvania Senate Republicans voted this month to subpoena records from Gov. Tom Wolf’s administration, including all 9 million registered voters’ nonpublic personal information, including the last four digits of their Social Security number and driver’s license number. They say they want to verify who cast ballots in the 2020 election and whether they were properly registered or fraudulent.

Senate Democrats and state Attorney General Josh Shapiro, a Democrat, have sued to block the subpoena and the investigation.

“No surprise in Arizona,” Wolf, the Democratic governor, wrote on Twitter Friday. “I won’t let Pennsylvania Republicans bring this circus here.”