Imagining Trump with a Republican-Controlled Congress and the Roberts Court

Some Republicans I know, even sane middle-of-the-road Republicans, tell me they are voting for Donald Trump. They have forgotten John F. Kennedy’s observation that sometimes “party loyalty demands too much.” Sure, they admit sub silentio, Trump is a vulgar, foul-mouthed, malevolent, corrupt, unfit, crazy grifter lacking in cognitive function, but they claim there are “guardrails” that will keep him on the right track.

The other evening, at the Council on Foreign Relations, someone who...