The heightening danger of nuclear war owes a great deal to Donald Trump, who, as U.S. President, not only wrecked key nuclear arms control and disarmament agreements of the past and future, but launched his nation and others on an escalating nuclear arms race.  Openly threatening nuclear war, Trump quickly revealed himself as remarkably willing to launch it, leaving top members of his administration aghast and scrambling to head off a nuclear Armageddon.