U.S. and Mexican trade negotiators are “hours” away from squaring away bilateral differences on the North American Free Trade Agreement (NAFTA) but work with Canada is likely to stretch into September, a top Mexican official said on Sunday. Mexican Economy Minister Ildefonso Guajardo told reporters that work with Canada, which has sat out the latest phase of NAFTA talks, would take at least a week, though he was optimistic Mexico and the United States were close to agreement. The Mexico-U.S. discussions have focused on crafting new rules for the automotive industry, which U.S. President Donald Trump has put at the heart of his drive to rework the 24-year-old pact he says has been a “disaster” for American workers.