A Republican congressman said Monday he hopes to have ABC News officials testify before the House about unfounded allegations the network worked with Vice President Kamala Harris to give her an advantage at last week’s debate against former President Donald Trump.

In an interview with Fox Business, Rep. Dan Meuser, R-Pa., cited an unconfirmed whistleblower affidavit circulating on social media among right-wing figures — including a Jan. 6, 2021, riot defendant and a news site with a history of posting misinformation and conspiracy theories. It appears to have originated on the account of a Trump supporter who posts anonymously. 

The alleged whistleblower, whose name is redacted, claims to be an ABC News employee with knowledge that the network provided the Harris campaign with sample questions, promised the campaign it would only fact-check Trump and agreed not to ask questions on topics the Harris campaign deemed off-topic. The document is dated Sept. 9, a day before the debate.

“We're going to do what we can to bring ABC in and have them answer some questions, as well as have this whistleblower and see what's going on as they're trying to tear down the First Amendment,” said Meuser, a member of the House Financial Services Committee.

Meuser’s office has not responded to an email from Spectrum News asking if the congressman has received the affidavit or seen it outside of social media. 

Spectrum News has also reached out to House Speaker Mike Johnson’s office because the alleged whistleblower claims to have written to Johnson to establish a record of communication before the debate. Johnson’s office has not responded.

Among ABC rules for the debate were that “No topics or questions will be shared in advance with campaigns or candidates.”

In a statement to Spectrum News, ABC News said it "followed the debate rules that both campaigns agreed on and which clearly state: No topics or questions will be shared in advance with campaigns or candidates.”   

The Harris campaign declined to comment Monday.

The allegations follow similar ones made by Trump both before and after the debate.

Trump complained the debate was “rigged” and that it was “three on one,” arguing ABC News moderators David Muir and Linsey Davis were unfair toward him.

Trump accused the moderators of fact-checking him and not Harris and suggested, without evidence, Harris may have been slipped debate questions in advance. 

“They had a rigged show with somebody that maybe even had the answers,” he told Fox News last week. “I mean, I'll be honest. I watched her talk, and I said, ‘You know, she seems awfully familiar with the questions.’”

Trump has said he won’t debate Harris again.

Polls have largely shown that voters believe Harris won the debate, although Trump has been declaring victory, saying it was his “best debate ever.”

Muir and Davis challenged some of Trump’s false and misleading statements, including about crime statistics and a baseless conspiracy theory that Haitian migrants are stealing and eating pets in Ohio.

Some misleading comments by Harris were indeed not fact-checked, such as her claims that Trump is associated with the conservative roadmap known as Project 2025 and that couples are being denied IVF treatment.

But the moderators let several other dubious Trump statements go unchecked as well, including about legal challenges to the 2020 election and House Speaker Nancy Pelosi’s authority in protecting the Capitol on Jan. 6, 2021.

Davis told The Los Angeles Times last week that ABC was trying to avoid a repeat of the June CNN debate between Trump and President Joe Biden, when Trump’s false statements were not addressed in real time. 

“People were concerned that statements were allowed to just hang and not [be] disputed by the candidate Biden, at the time, or the moderators,” she said.

In an interview with “Live with Kelly and Mark” on Monday, Muir dismissed talk about which candidate won the debate or the moderators’ performances as “just noise.”

“The most important thing to remember is that you all have the power,” Muir told voters in the audience.

Trump has called for ABC to lose its broadcasting license.

Meuser told Fox that Congress needs “to find out what the truth is.”

“And the thing is, as we all saw, we actually don't need a hearing to know what we saw,” he said. “But we're going to look to do it so as we can provide some evidence as to how manipulative that they are.”

Note: This article was updated with a statement from ABC News and a to correct a typo.