28 U.S.C. § 291 : US Code - Section 291: Circuit judges

Search 28 U.S.C. § 291 : US Code - Section 291: Circuit judges

(a) The Chief Justice of the United States may, in the public
interest, designate and assign temporarily any circuit judge to act
as circuit judge in another circuit upon request by the chief judge
or circuit justice of such circuit.
(b) The chief judge of a circuit or the circuit justice may, in
the public interest, designate and assign temporarily any circuit
judge within the circuit, including a judge designated and assigned
to temporary duty therein, to hold a district court in any district
within the circuit.