(a) When the subject matter of a case or proceeding is within his or her respective jurisdiction, the Assistant Attorney General, Criminal Division, the Assistant Attorney General for National Security, or any Deputy Assistant Attorney General, Criminal Division or of the National Security Division is authorized to exercise the authority vested in the Attorney General by 18 U.S.C. 6003 , to approve the application of a U.S. Attorney to a federal court for an order compelling testimony or the production