At the end of Alfred Hitchcock’s haunting “Vertigo” (1958) — perhaps his and cinema’s best — James Stewart’s detective figures out that the woman he’s fallen for (Kim Novak) is nothing but an imposter hired by a murderous husband to help make his wife’s death look like a suicide. And what clues him in? His beloved puts on a necklace that belonged to one of the dead woman’s ancestors.

“You shouldn’t keep souvenirs of a killing,” he tells her as he confronts her in the film’s harrowing final scene. “You shouldn’t have been that sentimental.”

“You shouldn’t keep souvenirs of a killing”:: I was reminded of that line as President Donald J. Trump prevented the demotion of Naval Special Operations Chief Edward Gallagher….