The leaders of the three major North American countries are meeting in Mexico to discuss trade, immigration, energy and other issues.
On Wednesday, US President Obama, Mexico's Enrique Pena Nieto and Canada's PM Stephen Harper are expected to hold joint and bilateral meetings.
Mr Obama faces stiff opposition from his own Congress on parts of his agenda on cross-border issues.
The three countries are in the midst of negotiating a trans-Pacific trade deal.
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