FILE - In this July 7, 2017, file photo, President Donald Trump meets with Russian President Vladimir Putin at the G20 Summit in Hamburg. Trump seems of two minds about nuclear weapons. He has mused about their elimination. But he also has called for a U.S. buildup and bragged about his nuclear "button." How these seemingly competing instincts will play out in his Helsinki talks with Putin on July 16, 2018, could profoundly affect the direction of U.S. defense policy. (AP Photo/Evan Vucci, File)
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