; and (2) designate and assign temporarily any district judge of the Ninth Circuit to hold a district court in any district within the Twelfth Circuit. (g) The chief judge of the Twelfth Circuit may in the public interest— (1) upon request by the chief judge of the Ninth Circuit, designate and assign one or more district judges within the Twelfth Circuit to sit upon the Court of Appeals of the Ninth Circuit or a division thereof whenever the business of that court so requires