The result was a slow-rolling collapse of the fragile alliances that officials at the summit — and even Mr. Thump’s own White House advisers — insisted throughout the day could be maintained in the face of fundamental disagreements. . . .
Mr. Trump confronted several of the leaders individually, giving examples of how, in his view, each of their countries had mistreated the United States, whether it be through trade barriers or security commitments, according to a European official.
The president delivered a running monologue in one of the closed-door meetings, one person familiar with the discussion said. One minute, he slammed Germany for taking advantage of the United States by selling so many cars there. The next, he talked about how his grandfather was German and how much he loved Europe.