John Harris: “In one light, it was all quite familiar. But the second occasion of Trump taking the oath of office also put him in an entirely new light. For the first time, he is holding power under circumstances in which reasonable people cannot deny a basic fact: He is the greatest American figure of his era.” “Let’s quickly exhale: Great in this context is not about a subjective debate over whether he is a singularly righteous leader or a singularly menacing one.