WASHINGTON, DC - APRIL 01: rime Minister of Canada Justin Trudeau (L) talks to U.S. President Barack Obama (R) during a scenario-based policy discussion of the 2016 Nuclear Security Summit April 1, 2016 in Washington, DC. U.S. President Barack Obama is hosting the fourth and final in a series of summits to highlight accomplishments and make new commitments towards reducing the threat of nuclear terrorism. (Photo by Alex Wong/Getty Images)
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