Assassination

Assassination is a movie starring Charles Bronson, Jill Ireland, and Stephen Elliott. A presidential bodyguard is assigned to protect an objecting first lady, as repeated attempts are made on her life.
Jay Killon is the bodyguard of the recently elected US president, but he is assigned to the first lady (Lara Royce). Lara hates Killon so she does all she can to escape. The story complicates when someone tries to kill Lara.