Trump and leaders of Mexico and Canada sign new trade pact

President Donald Trump, center, reaches out to Mexico’s President Enrique Pena Nieto, left, and Canada’s Prime Minister Justin Trudeau as they prepare to sign a new United States-Mexico-Canada Agreement that is replacing the NAFTA trade deal, during a ceremony at a hotel before the start of the G20 summit in Buenos Aires, Argentina, Friday. (AP Photo/Martin Mejia)

U.S. President Donald Trump and first ady Melania Trump arrive to the Ezeiza International Airport in Buenos Aires, Argentina, on Nov. 29, 2018. (Juan Ignacio Roncoroni/EFE/Zuma Press/TNS)

BUENOS AIRES, Argentina — President Donald Trump and the leaders of Canada and Mexico signed a revision of the quarter-century-old North American Free Trade Agreement early Friday, but their ceremony did not disguise the tensions remaining or lessen the doubts of whether a new Congress would approve the pact.