Donald Trump talks about NAFTA as though he as the authority to pull the U.S. from the deal alone. But some lawyers point out that withdrawal without congressional approval would be unconstitutional.
Econo-metrics: The July trade report also serves as a cautionary tale of what life could be like without NAFTA, as exports to the U.S. and Mexico suffered significantly
Canadian politicians know there are points to be scored with voters by threatening trade wars with America, but things could quickly spiral out of control