Conservative watchdog Judicial Watch is calling on Acting FBI Director Andrew McCabe to recover and release federal records and memos it claims were “unlawfully” removed by former Director James Comey, threatening the FBI with a lawsuit should the bureau not comply.

Tom Fitton, president of Judicial Watch, penned a letter to McCabe on June 14 warning of a potential violation of the Federal Records Act, which is the basis for the federal government’s policies regarding the “creating, maintaining, and disposing” of federal records.