"US President Donald Trump and first lady Melania Trump walk to Marine One on the South Lawn of the White House in Washington, DC, on October 13, 2017. Trump earlier on October 13 in a highly-anticipated address refused to certify the 2015 Iranian nuclear deal, and warned the United States may yet walk away from ""one of the worst"" agreements in history.( AFP PHOTO / Brendan Smialowski)"
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