I found my Deep Presidential Succession Act, drawn up hastily as a massive plague (engineered) was sweeping the solar system several hundred years from now. When/if I restart Tomorrow's Mountain, it's important. It's designed to ensure continuity of government almost no matter what.
A deep presidential succession act
The Presidential succession as ordained by other acts, both previously and subsequent to this act, shall take precedence over the order listed herein; this act is to provide for presidential succession in the event that none designated by other acts shall be eligible.
If no candidate under the existing succession shall be eligible, than presidency shall fall to the seniormost eligible senator, determined as follows:
Time in the senate shall determine seniority
If multiple senators have equal time in the senate, then precedence shall be determined in the order of the senator’s state’s admission to the Union.
If both senators from that state should be equal in seniority, than the one from the first district shall be president.
If no Senator shall be eligible, than presidency shall fall to the seniormost eligible member of the House of representatives, determined as follows:
Time served in the House of Representatives shall determine seniority
If multiple Representatives have equal time in the senate, then precedence shall be determined in the order of the Representative’s state’s admission to the Union.
If multiple Representatives from that state should be equal in seniority, than the one from the lowest numbered district shall be president.
If no president shall be chosen, then a state governor shall be president, with precedent determined by the state’s order of entry into the Union.
If no president shall be chosen, then a state lieutenant governor shall be president, with precedent determined by the state’s order of entry into the Union.
If no president shall be chosen, then the senior surviving member of the United States Military shall be president.