; and (2) subject to subsection (b), is in Alaska, Arizona, Idaho, Montana, or Nevada, shall be a circuit judge of the twelfth circuit as of such effective date. (b) Election by certain circuit judges A circuit judge in regular active service as described in subsection (a)(2) may elect to be permanently assigned to the new ninth circuit as of such effective date by notifying the Director of the Administrative Office of the United States Courts of such election. (c) Vacancies For each individual serving in the position of circuit judge of the former ninth circuit whose official duty station on the day before the effective date of this Act is in Alaska, Arizona, Idaho, Montana, or Nevada, after the date on which such individual ceases to serve as a circuit judge, the President shall appoint, by and with the advice and consent of the Senate, 1 additional circuit judge for the twelfth circuit, without regard to whether such individual makes an election described in subsection (b). 7. Election of assignment by senior judges Each judge who is a senior circuit judge of the former ninth circuit, whose official duty station on the day before the effective date of this Act is in Alaska, Arizona, Idaho, Montana, or Nevada, may elect to be assigned to the new ninth circuit or the twelfth circuit as of such effective date and shall notify the Director of the Administrative Office of the United States Courts of such election. 8. Authorization of temporary judgeships (a) In general For each circuit judge in regular active service who elects to be assigned to the new ninth circuit under section 6(b), the President shall appoint, by and with the advice and consent of the Senate, 1 additional circuit judge for the twelfth circuit, resident in the duty station of the circuit judge making the election as of the day before the effective date of this Act. (b) Vacancies For each appointment made under subsection (a) for the twelfth circuit, an equal number of corresponding vacancies in the position of circuit judge for the twelfth