2-16-513. Succession in case of termination or incapacitation of primary successors. (1) If, because of an enemy attack upon the United States, the governor, lieutenant governor, president pro tempore of the senate, and speaker of the house are killed or rendered unable to serve as governor, the senior member of the legislature shall act as governor.

(2) The senior member of the legislature shall call an emergency session of the legislature at a safe location within the state. The legislature meeting in joint session shall elect a governor.

(3) For the purposes of this section, the member with seniority is the member who has served in the legislature for the longest continuous period of time up to and including the member's current term. If two or more members of the legislature have equal seniority, the line of succession among them is from eldest to youngest in age.