"The president of the United States, now for 50 years, is followed at all times, 24 hours a day, by a military aide carrying a 'football' that contains the nuclear codes that he would use, and be authorized to use, in the event of a nuclear attack on the United States. He could launch the kind of devastating attack the world has never seen. He doesn't have to check with anybody. He doesn't have to call the Congress. He doesn't have to check with the courts. He has that authority because of the nature of the world we live in"