The Art of the Dunce: 15 Months Into His Presidency, Trump Can’t Negotiate His Way Out of a Paper Bag - Vanity Fair

Any sort of policy requires some firsthand mastery of details. Trump, as we know, lacks this. So when he goes into meetings with Democrats and gives away the store, only to backpedal hours later and pretend he didn't, his weakness as a negotiator is only one part of his vulnerability. The other, more brutal fact is that he simply doesn't know what's being discussed. ....
https://www.vanityfair.com/news/2018/03/trump-presidency-trump-cant-negotiate-his-way-out-of-a-paper-bag