WASHINGTON (AP) — Monday seemed like the end of President Donald Trump’s relentless challenges to the election, after the federal government acknowledged President-elect Joe Biden was the “apparent winner” and Trump cleared the way for cooperation on a transition of power.

But his baseless claims have a way of coming back. And back. And back.

On Thursday, after a Thanksgiving evening conversation from the White House with troops stationed overseas, Trump abruptly pivoted to angrily alleging — still without any evidence — that “massive fraud” was behind his defeat.

Speaking to news crews gathered to watch the traditional holiday conversation with the military, Trump denounced officials in battleground states he’d lost as “communists” and “enemies of the state.” Trump also announced he’d be traveling to Georgia to meet with what he said would be tens of thousands of supporters on Dec. 5, ahead of two runoffs there that will likely determine whether Republicans or Democrats control the Senate.

The 2020 presidential race is turning into the zombie election that Trump just won’t let die. Despite dozens of legal and procedural setbacks, his campaign keeps filing new challenges that have little hope of succeeding and making fresh, unfounded claims of fraud.

But that’s the point. Trump’s strategy, his allies concede in private, wasn’t to change the outcome, but to create a host of phantom claims about the 2020 presidential race that would infect the nation with doubt and keep his base loyal, even though the winner — Biden — was clear and there has been no evidence of mass voter fraud.

“Zombies are dead people walking among the living — this litigation is the same thing,” said Franita Tolson, a professor at the University of Southern California Gould School of Law. “In terms of litigation that could change the election, all these cases are basically dead men walking.”

It’s a strategy tolerated by many Republicans, most notably Senate Majority Leader Mitch McConnell of Kentucky, who are clinging to Trump as they face a test of retaining their own power in the form of two runoff elections in Georgia in January.

“This really is our version of a polite coup d’etat,” said Thomas Mann, senior resident scholar at the Institute of Governmental Studies at the University of California at Berkeley. “It could end quickly if the Republican Party acknowledged what was going on. But they cower in the face of Trump’s connection with the base.”

A day after Trump said his administration should begin working with Biden’s team, three more lawsuits were filed by allies attempting to stop the certification in two more battleground states. In Minnesota, a judge did not rule on the suit and the state certified the results for Biden. Another was filed in Wisconsin, which doesn’t certify until Tuesday. Arizona Republicans filed a complaint over ballot inspection; the state certification is due Monday.

And the campaign legal team said state lawmakers in Arizona and Michigan would hold meetings on the election “to provide confidence that all of the legal votes have been counted and the illegal votes have not been counted in the November 3rd election.”