In Rumsfeld v. Padilla, __ U.S. __, 2004 WL 1432135 (June 6, 2004) (habeas is  limited to the "immediate custodian"; proper respondent to habeas is "the person" with ability to produce prisioners body before court, i.e. the warden of facility where prisoner is being held, not Attorney General or other remote supervisory official).