President Barack Obama, Mexico's President Felipe Calderon, and Canada's Prime Minister Stephen Harper arrive for a joint news conference in the Rose Garden at the White House in Washington, Monday, April 2, 2012. (AP Photo/Charles Dharapak)

Associated Press
President Barack Obama, Mexico's President Felipe Calderon, and Canada's Prime Minister Stephen Harper arrive for a joint news conference in the Rose Garden at the White House in Washington, Monday, April 2, 2012. (AP Photo/Charles Dharapak)
President Barack Obama, Mexico's President Felipe Calderon, and Canada's Prime Minister Stephen Harper arrive for a joint news conference in the Rose Garden at the White House in Washington, Monday, April 2, 2012. (AP Photo/Charles Dharapak)
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