Donald Trump cuts off U.K. ambassador after leaked memos: 'We will no longer deal with him'

President Trump excommunicated the British ambassador via tweet and slammed U.K. Prime Minister Theresa May's handling of Brexit on Monday, saying she created a "mess" and that he's kept up appearances for Her Majesty.

Mr. Trump is fuming after the publication of leaked memos in which Kim Darroch, the U.K.'s ...