The Sentinel (2006 film)

The Sentinel is a 2006 crime thriller film directed by Clark Johnson about a veteran United States Secret Service bodyguard who is suspected as a traitor after an attempted assassination of the president reveals that someone within the Service is providing information to the assassins.

Peter Pete Garrison Michael Douglas is a Secret Service agent and one of the personal bodyguards for First Lady of the United States Sarah Ballentine Kim Basinger, with whom he is having an affair. He is one of the oldest and most experienced agents, having been involved in saving Ronald Reagans life during the Reagan assassination attempt.A fellow agent and close friend, Charlie Merriweather Clark Johnson, is murdered. Garrison gets word from a trusted informant that the killing of Merriweather is related to an assassination plot against the President. The intelligence provided by the informant reveals that a mole with access to the Presidents security detail had provided information to the assassins. ........

Source: Wikipedia