Mr. Karl, the chief White House correspondent for ABC News, necessarily tells the story from the media’s side, but he is a fair-minded reporter rather than a media cheerleader. Unlike other books about Mr. Trump by members of the news media, Mr. Karl’s book presents the 45th president as a complex, multilayered person: self-regarding, sometimes mean, disdainful of factual accuracy; but also approachable to ordinary people, at times reflective, and smarter than his critics give him credit for.