President Donald Trump shakes hands with Mexico President Enrique Pena Neto, left, as Canada's Prime Minister Justin Trudeau, right, looks on after participating in the USMCA signing ceremony, Friday, Nov. 30, 2018 in Buenos Aires, Argentina. A deal on amending the new North American free trade agreement appears close following a busy weekend, with hopes Canada, Mexico and the United States will approve a rewritten deal in the next 24 hours. (THE CANADIAN PRESS/AP-Pablo Martinez Monsivais)