At no point did the president seem to understand his role of alliance leader. Pressed to commit to a climate-change treaty, he tweeted, "I'll be making my final decision on the Paris Accord next week!" - almost as if this were a television series that relied on cliffhangers to keep people watching. Proving that he still sees the world through the eyes of a property developer, he complained to the Belgian prime minister about European regulations that had slowed down the construction of one of his golf courses. Before the NATO summit photograph, Trump shoved aside the Montenegrin prime minister to put himself in front, because that's what boorish celebrities do.