28 U.S.C. § 1651 : US Code - Section 1651: Writs
Search 28 U.S.C. § 1651 : US Code - Section 1651: Writs
(a) The Supreme Court and all courts established by Act of Congress may issue all writs necessary or appropriate in aid of their respective jurisdictions and agreeable to the usages and principles of law. (b) An alternative writ or rule nisi may be issued by a justice or judge of a court which has jurisdiction.