In the Line of Fire (1993)

Frank Horrigan (Clint Eastwood) is a Secret Service Agent who keeps thinking back to November 22, 1963, when, as a hand-picked Agent by President John F. Kennedy, he became one of the few Agents to have lost a President to an assassin when Kennedy died. Now, former C.I.A. assassin Mitch Leary (John Malkovich) is stalking the current President (Jim Curley), who is running for re-election. Mitch has spent long hours studying Horrigan, and he taunts Horrigan, telling him of his plans to kill the President. Leary plans to kill the President because Leary feels betrayed by the government.