(a) Before an emergency event, if a member fails to designate the required minimum number of emergency interim successors within 30 days of the member's taking of the oath of office, or, after such period, if for any reason the number of emergency interim successors for any member falls below the required minimum and remains below such minimum for a period of 30 days, then the required minimum number of emergency interim successors must be designated under the following procedures:
(1) The President Pro Tempore of the Senate shall designate as many emergency interim successors for the members of the majority party in the Senate as are required to achieve such minimum number.
(2) The Minority Leader of the Senate shall designate as many emergency interim successors for the members of the minority party in the Senate as are required to achieve such minimum number.
(3) The Speaker of the House of Representatives shall designate as many emergency interim successors for the members of the majority party in the House of Representatives as are required to achieve such minimum number.
(4) The Minority Leader of the House of Representatives shall designate as many emergency interim successors for the members of the minority party in the House of Representatives as are required to achieve such minimum number.
(b) The President Pro Tempore of the Senate, the Minority Leader of the Senate, the Speaker of the House of Representatives, and the Minority Leader of the House of Representatives may not assign to any of their designees a rank in order of succession higher than that of any remaining emergency interim successor previously designated by a member for succession to the member's own powers and duties.
(c) (1) Each emergency interim successor designated under subsection (a) of this section serves at the pleasure of the individual designating the successor.
(2) Notwithstanding paragraph (c)(1) of this section, the member for whom the emergency interim successor is designated may change the rank in order of succession, or replace at the member's pleasure, any emergency interim successor designated under subsection (a) of this section.