Watch Designated Survivor full episodes online.
Synopsis: As a lower-level cabinet member, Tom Kirkman never imagined something would happen that would catapult him to the oval office. When a devastating attack on the night of the State of the Union address claims the lives of the president and most of the Cabinet, the Housing and Urban Development secretary -- who was named the designated survivor in case of such an event -- finds himself promoted to leader of the free world. Suddenly thrust into his new position of power, Kirkman struggles to keep the country from dissolving into chaos and must adjust to his new normal, unaware of what fresh horrors may await the United States.
More info: IMDB, Wikipedia