"Eager to defend the civilian control of nuclear weapons from military encroachment, John F. Kennedy and Robert McNamara had fought hard to ensure that only the president could make the ultimate decision. But they hadn't considered the possibility that the president might be clinically depressed, emotionally unstable, and drinking heavily--like Richard Nixon, during his final weeks in office. Amid the deepening Watergate scandal, Secretary of Defense Schlesinger told the head of the Joint Chiefs to seek his approval before acting on "any emergency order coming from the president." Although Schlesinger's order raised questions about who was actually in command, it seemed like a good idea at the time."