(a) The powers and duties of an office of the state or of a political subdivision may be exercised by an emergency interim successor under this chapter only if there has been an attack or series of attacks on the United States by an enemy of the United States that causes or may cause substantial damage or injury to civilian property or individuals in the United States by:
(1) sabotage;
(2) the use of bombs, missiles, shell fire, or atomic, radiological, chemical, bacteriological, or biological means; or
(3) the use of other weapons or processes.
(b) The designated emergency interim successor to an officer of the state or of a political subdivision, in the order specified, shall exercise the powers and perform the duties of the office if:
(1) the officer and the officer’s deputy are absent or unable to exercise the powers and perform the duties of the office; or
(2) the office is vacant and a deputy is not authorized to perform the duties of the office.

(c) The emergency interim successor to a state officer shall exercise the powers and perform the duties of the office until:
(1) the governor or other official authorized to exercise the powers and perform the duties of the governor appoints a successor to fill the vacancy;
(2) a successor is otherwise appointed or elected and qualifies; or
(3) the officer, the officer’s deputy, or a preceding named emergency interim successor is available to exercise the powers and perform the duties of the office.
(d) The emergency interim successor to an officer of a political subdivision shall exercise the powers and perform the duties of the office until:
(1) the vacancy is filled; or
(2) the officer, the officer’s deputy, or a preceding emergency interim successor is available to exercise the powers and perform the duties of the office.