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President Barack Obama shakes hands with Canadian Prime Minister Justin Trudeau before the start of their bilateral meeting at Parliament Hill, Wednesday, June 29, 2016 in Ottawa, Ontario. (AP Photo/Pablo Martinez Monsivais)

President Barack Obama shakes hands with Canadian Prime Minister Justin Trudeau before the start of their bilateral meeting at Parliament Hill, Wednesday, June 29, 2016 in Ottawa, Ontario. (AP Photo/Pablo Martinez Monsivais)