Diana and Donald shared a few things in common: their toxic tango with the press, their psychic connection with their fan base, their willingness to blow up norms. They were both “unpredictable meteors,” as Tony Blair once described Di. They both savored sitting in their rooms glued to their own coverage on TV, dialing up their chosen reporters to control the narrative. They were both unhappy at the top, fretting about being undercut. Diana almost upended the monarchy, and Trump is doing his worst to upend democracy.