Canada's Prime Minister Stephen Harper, right, walks with President Barack Obama during the North American Leaders Summit in Toluca, Mexico, Wednesday, Feb. 19, 2014. Obama is in Toluca for a one-day summit with Mexican and Canadian leaders, meeting on issues of trade and other neighbor-to-neighbor interests, even as Congress is pushing back against some of his top cross-border agenda items. (AP Photo/The Canadian Press, Sean Kilpatrick )
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