If President Trump imposes tariffs on Canadian goods, experts say Canada has a strong case to challenge it under the Canada-US-Mexico free trade agreement. The question, though, is how quickly any decision may come through the process and whether the US would respect any decisions from the outcome. …The free trade agreement is a nation-to-nation agreement, so there’s no one else to appeal to. America’s past performance on adhering to trade decisions has been mixed. Areas of contention include… the long-running softwood lumber dispute. …Canada could also decide to challenge this round of tariffs at the WTO, as well as through CUSMA. Based on the rules of the treaty, Canada could launch a challenge which would prompt mandatory consultations within 30 days. If there’s no resolution through that step, the next would be to establish a dispute settlement panel. …Past cases have generally run around a year to a year and a half.