Mike Banning is a Secret Service Agent who is assigned to the President and is close to him and his family. When there's a situation wherein the President and the First Lady's life is endangered and Mike can only save one of them, he saves the President. As a result the President has Mike reassigned to a desk job. A few years later, Mike wants to come back but the President though not holding a grudge is not ready to have him back. The President has a delegation from South Korea visiting. Shortly after they arrive a plane shows up and when it's told to land it refuses and when aircraft comes to it, it shoots it down. Eventually it crashes at the White House, that's when some people in the crowd pull guns and shoot the secret service agents. Then the Secret Service gets the President into a bunker. Mike who sees what's happening from his office goes there and starts shooting at the shooters. Later in the bunker, some of the people from the delegation pull out guns and shoot all the Secret Service agents. And outside all the Secret Service agents are killed and the shooters take over the White House. Eventually they call the Pentagon where the Speaker of the House is now in charge and the leader in the bunker makes his demands. The Chairman of the Joint Chiefs tells the Speaker they can't give in but to prove he's serious he kills someone and will continue to do so till they give in. But what can they do. Mike, who's in the White House, eventually gets a special cellphone and calls them. He tries to do what he can first by locating the President's son and getting him out. He then goes to save the President.