SEVEN DAYS IN MAY (1964) May be

Ramrod straight, straight-arrow Col. Martin "Jiggs" Casey (Kirk Douglas) is aide to megalomaniacal General James Mattoon Scott (Burt Lancaster) in SEVEN DAYS IN MAY, a classic hawk vs. dove clash of brass. Seven days hence, Scott intends to overthrow a president he considers "criminally soft" on nuclear armament. Jiggs is loyal, but having been cut out of the coup loop, he’s also nosy. When he uncovers his boss's nefarious plan to move into the White House without the fuss and bother of a national election, he blows the whistle. Like FAIL SAFE (also 1964), MAY could very well be.