is the subject of my latest Bloomberg column. An excerpt:

But even if Trump gave the book credibility, the harm it can do to him is limited. We didn’t need the book to spot these character traits in Trump, which have been as visible in the last two years’ news as his name is on his buildings. And the long-running debate over Trump’s fitness for office would probably be a little more productive without the book, which cuts enough corners to leave unclear which stories to believe.
Both sides are thus confirmed in their prior assumptions: It reinforces Trump’s opponents in their negative opinion of the president, and Trump’s supporters in their negative opinions of the media.