The Show Must Go On Madam Secretary : Season 2 Episode 1

When contact with Air Force One has been lost with the president and speaker of the House aboard, the vice president in surgery and the president pro tempore of the Senate incapacitated, Madam Secretary became Madam acting President. Her daughter was found in a hotel room with the President's son and her husband is being forced to turn one of his Russian students into an American spy. The secretary was supposed to sing a novelty song at the Eastern Trade Conference. Fortunately, she didn't.