Former President Donald Trump has not given up on trying to overturn the 2020 presidential election, according Wisconsin’s Assembly speaker.

Republican Speaker Robin Vos told Milwaukee ABC affiliate WISN-TV on Tuesday that Trump called him last week asking him again to decertify Joe Biden’s victory in the state.

Trump, Vos said, was spurred to call him by the state Supreme Court’s ruling earlier this month that absentee ballot drop boxes can only be placed in election offices. 

After Trump lost the state, he and Republicans alleged that drop boxes facilitated cheating, even though they offered no evidence. 

Biden defeated Trump by fewer than 21,000 votes. His victory has survived two recounts, multiple lawsuits, a nonpartisan audit and a review by a conservative law firm.

"It’s very consistent," Vos said of Trump’s call. "He makes his case, which I respect. He would like us to do something different in Wisconsin. I explained it's not allowed under the constitution. He has a different opinion.

"The court case, as you read it, does not go back and say what happened in 2020 was illegal," Vos said. "It just says going forward it can’t happen."

After Vos’ refusal, Trump attacked the Assembly speaker in a post on his Truth Social platform.

“Looks like Speaker Robin Vos, a long time professional RINO always looking to guard his flank, will be doing nothing about the amazing Wisconsin Supreme Court decision stating loud and clear that the impossible to control Ballot ‘Unlock’ Boxes in the State are ILLEGAL,” Trump wrote. “What a waste of a brilliant and courageous decision by Wisconsin’s Highest Court. The Democrats would like to sincerely thank Robin, and all of his fellow RINOs, for letting them get away with ‘murder.’ A Rigged & Stolen Election!”

RINO is a favorite Trump term that stands for “Republican in name only.”

Trump went after Vos again Tuesday, posting that he believes Vos’ primary opponent next month, Adam Steen, “will do well if Speaker Vos doesn’t move with gusto.” The former president has not officially endorsed a candidate in the race.

Trump’s efforts to pressure state officials into overturning the election results is one of the topics on which the House committee investigating the Jan. 6 Capitol insurrection and the events that led up to it has focused. In a June 21 hearing, Arizona House Speaker Rusty Bowers and Georgia Secretary of State Brad Raffensperger, both Republicans, testified Trump and his allies pushed them to declare Trump the winner despite him losing the vote count and there being no evidence of fraud. 

“And when they wouldn't embrace the big lie and substitute the will of the voters with Donald Trump's will to remain in power, Donald Trump worked to ensure they'd face the consequences, threats to people's livelihood and lives, threats of violence that Donald Trump knew about and amplified,” committee Chairman Bennie Thompson, D-Miss., said during the hearing.

In Georgia, Fulton County District Attorney Fani Willis is investigating Trump's attempts to overturn the election, and the Jan. 6 committee has said it has enough evidence to suggest Trump engaged in a criminal conspiracy to defraud the United States and obstructed an official proceeding, the joint session of Congress where the Electoral College votes are certified.

In June 2021, a day after Trump threatened to support a primary opponent against him, Vos hired former Wisconsin Supreme Court Justice Michael Gableman to investigate the former president’s loss to Biden in Wisconsin.

Gableman has issued two interim reports, but his work has faced a barrage of bipartisan criticism. The probe has not found evidence the election was incorrectly called for Biden, although in March Gableman said the state Legislature should “take a very hard look at the option of decertification of the 2020” presidential election. Nonpartisan attorneys say such a move would be illegal.

Even if Trump had won Wisconsin’s 10 electoral votes, he would not have won the presidency.

Neither Trump nor the Jan. 6 committee responded Wednesday to Spectrum News’ requests for comment.

The Associated Press contributed to this report.