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鈥檚 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鈥檚 Russia鈥攖hat is, if his tweets don鈥檛 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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