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In the United States, a designated survivor (or designated successor) is a named individual in the presidential line of succession, chosen to stay (at a secure and undisclosed location) away from events such as State of the Union addresses and presidential inaugurations. The practice of designating a successor is intended to safeguard continuity in the office of the president in the event the president along with the vice president and multiple other officials in the presidential line of succession died in a Mass-casualty incident. The procedure originated in the 1950s during the Cold War with its risk of nuclear attack.
If such an event occurred, the surviving official highest in the line of succession as delineated in the Presidential Succession Act of 1947 would become acting president of the United States. Consequently, the individual named must be eligible to serve as president. In practice, the designated survivor is usually a member of the president's Cabinet, and is chosen by the president.
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