Ray Epps, a former Trump supporter who was present at the Capitol when the January 6 riot occurred, filed a lawsuit accusing Fox News of defamation on Wednesday.

The suit accuses Fox News host Tucker Carlson of promoting the unfounded theory that Epps was an undercover federal agent who entrapped Trump supporters by encouraging them to trespass at the Capitol.

Epps, who appears in several videos encouraging fellow Trump supporters to enter the Capitol building, cooperated with investigators and was not prosecuted as a result, according to the FBI. But Carlson and other prominent right-wing voices have argued that Epps may have escaped prosecution because he “helped stage-manage the insurrection” as an undercover agent.

“Just as Fox had focused on voting machine companies when falsely claiming a rigged election, Fox knew it needed a scapegoat for January 6th,” the complaint, first reported by the New York Times, reads. “It settled on Ray Epps and began promoting the lie that Epps was a federal agent who incited the attack on the Capitol.”

Epps filed his complaint with the Superior Court in Delaware, the same jurisdiction where Fox recently agreed to a blockbuster settlement totaling nearly $800 million in April.

Epps is a U.S. Marine veteran who says he was forced to sell his Arizona ranch and wedding venue business and relocate to a mobile home in a remote part of Utah with his wife after receiving a torrent of death threats.