Not since the Vietnam War have the politics of American foreign policy been this polarized. President Trump and many of his backers believe that the Iran nuclear deal, President Obama’s signature diplomatic accomplishment, was an act of appeasement and betrayal worthy of Neville Chamberlain. Meanwhile, many Democrats and some Republicans think Mr. Trump will sell the country to Vladimir Putin’s Russia—that is, if his tweets don’t trigger a nuclear war with North Korea first. Allies worry that the U.S. is losing its grip; adversaries hope they are right.
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