Barack Obama, Justin Trudeau, Michelle Obama, Sophie GregoireTurdeau

President Barack Obama, Canadian Prime Minister Justin Trudeau, first lady Michelle Obama, and Sophie GregoireTurdeau, wave from the Truman Balcony during a state arrival ceremony on the South Lawn of White House in Washington, Thursday, March 10, 2016. (AP Photo/Susan Walsh)

President Barack Obama, Canadian Prime Minister Justin Trudeau, first lady Michelle Obama, and Sophie GregoireTurdeau, wave from the Truman Balcony during a state arrival ceremony on the South Lawn of White House in Washington, Thursday, March 10, 2016. (AP Photo/Susan Walsh)