In August 1974, Defense Secretary James Schlesinger ordered U.S. commanders to confirm any nuclear launch order from Richard Nixon with him or Henry Kissinger. Watergate had isolated a drinking president — sole constitutional authority had become a single point of failure. Consequently, senior officials built an extra-legal brake around the nuclear football without a formal amendment. Today, a different kind of command problem looms over the American triad — one driven not by an intoxicated executive, but by a radicalizing Western political landscape.Democrats spent years warning that President Donald Trump’s impulsiveness would produce reckless nuclear use. Instead, Trump finished his...