The exclusion coincides with a sharp escalation in U.S.-Canada trade tensions. On July 20, President Trump signed three proclamations under Section 338 of the Tariff Act of 1930, imposing additional 50% tariffs on a wide range of Canadian goods. The White House said the action responds to Canadian discrimination against U.S. autos, alcohol, and dairy products. The tariffs are scheduled to take effect on August 19, 2026, giving both sides a 30-day window for negotiations.
The product list is broad. It includes wine, hockey sticks, cement, dairy products, furniture, clothing, and other consumer and industrial items. Energy, potash, fish, and critical minerals are excluded, as are goods already subject to Section 232 national security tariffs. Notably, the new duties apply even to goods that qualify for preferential treatment under the USMCA, overriding the pact's tariff-free provisions.
The legal basis is itself a landmark. Section 338 allows a president to impose tariffs of up to 50% when a foreign country discriminates against U.S. commerce. The provision had never been used before. The administration argues that Canada maintains a 25% tariff on U.S. motor vehicles that do not qualify for USMCA preferences, applies tariff-rate quotas that favor other countries, and has allowed most provinces to stop selling American liquor while not restricting alcohol from other nations.