The first use of nuclear weapons occurred Aug. 6, 1945. The second occurred three days later. That there has not been a third is testimony to the skill and sobriety of 12 presidents and many other people, here and abroad. Today, however, North Korea's nuclear bellicosity coincides with the incontinent tweeting, rhetorical taunts and other evidence of the frivolity and instability of the 13th president of the nuclear era. His almost daily descents from the previous day's unprecedentedly bad behavior are prompting urgent thinking about the constitutional allocation of war responsibilities, and especially about authority to use U.S. nuclear weapons.
