The Department of Justice manipulated evidence in the child-sex trafficking trial of convicted cult leader Keith Raniere, a group FBI experts backed by famed attorney Alan Dershowitz claimed Thursday.

Raniere was convicted in 2019, but now the group of six veteran FBI forensic experts claims the government framed him. They held a virtual press conference on Thursday, joined by Dershowitz, who is representing Raniere, former U.S. Attorney Bud Cummins, and several others.

“If true, this is a historic level of corruption,” Dershowitz said. “There must be immediate action.”

The forensic experts said they examined the government’s evidence and concluded that the “digital evidence devices” used to convict Raniere of child pornography and sexual exploitation of a minor were “significantly manipulated.”