Trump stops mid-speech in Iowa, opens his mouth in a bizarre, fish-out-of-water expression, holds the face for a moment, then resumes talking as if nothing happened. No punchline and no reaction from the crowd. No apparent connection to what he was saying. Just an unexplained intermission in the middle of a presidential speech. The president is not supposed to come with unexplained facial interludes. And when Trump starts looking like a glitch in his own teleprompter, Americans are entitled to ask what they’re witnessing.