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.