President Donald Trump shows a signed Presidential Memorandum after delivering a statement on the Iran nuclear deal from the Diplomatic Reception Room of the White House, Tuesday, May 8, 2018, in Washington. (AP Photo/Evan Vucci)
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President Donald Trump withdrew the U.S. from the landmark nuclear accord with Iran Tuesday, declaring he was making the world safer in restoring harsh sanctions. But he also dealt a profound blow to allies, deepened his isolation on the world stage and revived doubts about American credibility in the most consequential foreign policy action of his presidency.