It is by now a familiar, humiliating pattern. European leaders cajole, argue and beg, trying to persuade President Trump to change his mind on a vital issue for the trans-Atlantic alliance. Mr. Trump appears to enjoy the show, dangling them, before ultimately choosing not to listen.
Instead, he demands compliance, seemingly bent on providing just the split with powerful and important allies that China, Iran and Russia would like to exploit.
Such is the case with the efforts to preserve the 2015 Iran nuclear pact. Both the French president, Emmanuel Macron, and the German chancellor, Angela Merkel, made the pilgrimage to Washington to urge Mr. Trump not to scrap the agreement. Their failure is very similar to what happened with the Paris climate accord, and to what is happening now with unilateral American sanctions imposed on steel and aluminum imports, and to Mr. Trump’s decision to move the United States Embassy in Israel to Jerusalem.