U.S. President Barack Obama delivers opening remarks the first plenary session of the Nuclear Security Summit in Washington on April 1, 2016.
Jonathan Ernst—Reuters
April 1, 2016 5:44 PM EDT

President Barack Obama was due to give a press conference Friday afternoon as the Nuclear Security Summit came to an end.

Obama brought together over 50 world leaders in Washington D.C. to discuss how to keep nuclear materials safely secured. The summits have been held every two years since 2010.


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