The former acting U.S. attorney for the District of Columbia appears to have violated Justice Department rules by giving an interview to 60 Minutes in which he discussed pending criminal cases from the Jan. 6 riots at the U.S. Capitol, a top prosecutor told a federal judge Tuesday.

Michael Sherwin, a Trump appointee who recently departed the federal prosecutor’s office in D.C., spoke about the cases in the interview that broadcast March 21, a rare occurrence in pending prosecutions. After The New York Times reported Monday that sedition charges may be coming in a conspiracy case against several members of the far-right Oath Keepers, U.S. District Judge Amit Mehta of the District of Columbia—who is presiding over those defendants—on Tuesday morning summoned all attorneys involved in the case to appear in his virtual courtroom.