New York Times op-ed by former Obama staffers Steve Simon and Jonathan Stevenson is genuinely shocking: it urges European countries to withdraw their diplomats from the U.S. and expel American ambassadors. Seriously: After months of swaggering hesitation, President Trump finally announced the United States’ withdrawal from the nuclear deal with Iran, to which Britain, France, Russia, China, Germany and the European Union are also parties. This action tramples on European leaders, who urged Mr. Trump to exercise restraint in the interest of international security and multilateralism. So the Obama staffers’ indictment of President Trump is weak, to say the least....