Trump escalates trade war against Canada with threat to impose 50% tariffs
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- Trump signed three proclamations invoking Section 338 of the Tariff Act of 1930 — never previously used — to impose 50% tariffs on roughly US$20 billion of Canadian goods (about 5% of Canada's exports to the U.S.), effective Aug. 19 with no USMCA exemption.
- The levies hit Canadian alcohol and dairy in response to provincial retaliation (Canadian imports of U.S. alcohol dropped 81% after bans took effect) and a grab bag of hundreds of other goods including hockey sticks, cement, Christmas ornaments, and "mosses and lichens," while exempting oil, gas, potash, fish, and critical minerals.
- Prime Minister Mark Carney called the move a unilateral violation of USMCA, said Canada had "merely matched" U.S. measures, and pledged to "intensify" talks after earlier concessions including cancelling a digital services tax and cutting retaliatory tariffs failed to break the standoff.
- Brian Clow, Justin Trudeau's former advisor on U.S. relations, called it "a big escalation" designed to "maximize the economic and political pain" on Canada, while KPMG's Lachlan Wolfers noted the legal authority is untested after the Supreme Court struck down other Trump tariff powers earlier this year.
- Canadian premiers struck defiant tones — Ontario's Doug Ford urged "tariff for tariff, dollar for dollar" retaliation, Quebec's Christine Fréchette declared supply management "non-negotiable," and B.C.'s David Eby said Trump "doesn't have a friend in the world."
- California winemakers cheered the move, with the Wine Institute's Steve Gross citing a US$357-million drop in exports to Canada since 2024 and blaming provincial bans for "significant harm on both sides of the border."
- The U.S. opted not to renew USMCA earlier this month, triggering annual reviews set to last a decade, and Trump is expected to announce additional tariffs on other countries this week following a probe into goods made by forced labour as he seeks legal workarounds for levies previously struck down.
Why it matters: The Section 338 authority has never been tested in court and follows other Trump tariff powers the Supreme Court has already struck down — so the 50% levies carry legal uncertainty even as roughly US$20 billion in Canadian goods absorb the immediate hit with no USMCA exemption. Canada has already conceded on digital taxes, border security, and military spending without getting tariffs lifted, raising the stakes of Carney's pledge to "intensify" talks.
