Trump and leaders of Mexico and Canada sign new trade pact, but uncertainty remains

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.

At the event, on the sidelines of an international summit in Buenos Aires, Trump touted the hard-fought deal as "a truly groundbreaking achievement" and proudly held up the signed agreement for the cameras at the conclusion of a short ceremony. With Democrats taking control of the House in January, its passage through Congress remains uncertain, but the president professed confidently that he didn't expect "much of a problem."

Democrats have signaled they won't support the