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US President Barack Obama and Canada's Prime Minister Justin Trudeau hug during a welcome ceremony during a State Visit at the White House on March 10, 2016 in Washington, DC. / AFP / Nicholas Kamm (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)

US President Barack Obama and Canada's Prime Minister Justin Trudeau hug during a welcome ceremony during a State Visit at the White House on March 10, 2016 in Washington, DC. / AFP / Nicholas Kamm        (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)