As President Donald Trump implements his misguided tariff policies, Canadian decision-makers would do well to exercise caution in negotiations with our American neighbours. Trump has imposed — or threatened to impose — tariffs on a wide array of Canadian products, citing an ever-changing list of grievances: the fentanyl crisis, border security, digital services taxes, supply management policies, defense spending, softwood lumber, banking regulations, transboundary water management, and more. Now, with a looming “review” of CUSMA, Canada’s free trade agreement with the U.S. and Mexico, Trump has reversed course. Having once praised CUSMA as an “historic win” and the “largest, most significant, modern, and balanced trade agreement in history” the U.S. had ever signed, he now behaves as if it was a disaster that must be renegotiated immediately. Canada’s dairy and poultry industries, among others, will undoubtedly be in his crosshairs.