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The "designated survivor" for tonight's State of the Union address has been named, and it's Department of Homeland Security head Jeh Johnson.

Each year, a member of the president's cabinet sits out the speech in case of a catastrophic event that wipes out the rest of the line of presidential succession.

Johnson has served as the head of DHS since 2013.

Homeland Security Secretary Jeh Johnson participates in a discussion on how the Homeland Security Department is working with the Pentagon, intelligence community and other law enforcement agencies to fight terrorism, cybercrime and other threats to the homeland, in Washington, DC, USA, 07 December 2015.MICHAEL REYNOLDS / EPA