During an Oversight and Government Reform Committee hearing, Congressman Ken Buck questioned the Inspectors General.  Witnesses who testified were The Honorable Michael E. Horowitz, IG of the Department of Justice; the Honorable Arthur A. Elkins, Jr., IG of the Environmental Protection Agency; and Ms. Kathy A. Buller, Inspector General of the U.S. Peace Corps. 

http://oversight.house.gov/hearing/inspectors-general-independence-access-authority-2/