From Wikipedia: Path to War is a 2002 American biographical television film, produced by HBO and directed by John Frankenheimer that deals directly with the Vietnam War as seen through the eyes of United States President Lyndon B. Johnson and his cabinet members. It was the final film (theatrical or made-for-TV) that was directed by Frankenheimer, who died seven weeks after the film debuted on HBO.
The film stars Michael Gambon as President Johnson, Alec Baldwin as Secretary of Defense Robert McNamara and Donald Sutherland as presidential advisor Clark M. Clifford, who succeeds McNamara as Secretary of Defense.