BUSINESS

Untested in court, Trump’s new tariffs on Canada raise legal questions

PUBLISHED Aug 29, 2026, 9:09 AM ET

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President Donald Trump has invoked Section 338 of the Tariff Act of 1930 to impose 50% tariffs on approximately $20 billion in Canadian imports, a statute never before used or tested in court [citation:1]. The tariffs, effective August 22, 2026, target Canadian motor vehicles, alcohol, and dairy products, and apply regardless of USMCA eligibility [citation:10]. Legal scholars and trade lawyers argue the Depression-era law may have been superseded by the Trade Expansion Act of 1962 and the Trade Act of 1974, making it vulnerable to challenge [citation:1]. Ilya Somin, a law professor involved in the successful Supreme Court challenge to Trump's previous IEEPA tariffs, said a legal challenge is "overwhelmingly likely" [citation:3]. Canada has announced dollar-for-dollar retaliatory tariffs set for September 8, 2026 [citation:10]. The tariffs follow the collapse of last-minute negotiations and represent an escalation in the trade conflict between the two allies [citation:10].

By James Porter | JQJO News

Timeline of Events

1930 — Congress passed Smoot-Hawley Tariff Act, including never-used Section 338.
1932 — US considered Section 338 against Spain but ultimately did not.
1949 — US considered Section 338 against Communist China but never used.
1962 — Congress passed Trade Expansion Act, arguably superseding Section 338.
1974 — Congress passed Trade Act, granting president tariff powers with limits.
On July 20 2026 Trump invoked Section 338, imposing 50% tariffs on Canada.
On August 18 2026 Trump paused tariffs for three days citing a deal.
On August 21 2026 Canada suspended negotiations, tariffs set for next day.
On August 22 2026 50% Section 338 tariffs took effect on Canadian goods.
On August 22 2026 Canada announced retaliatory tariffs effective September 8.
Legal challenges from industry groups and states are overwhelmingly likely.
Courts may rule Section 338 obsolete or unconstitutional if challenged.
US-Canada trade relations may remain strained for extended period.

News Intelligence

Immediate US impact: Higher costs for businesses importing targeted Canadian goods.
Possible long-term US impact: Potential trade disruption with a major ally and legal uncertainty.
Most affected groups: US importers, manufacturers, and consumers of Canadian products.
Reader priority: Monitor legal challenges and follow official court and government sources.

Explain Framing

Left: Focuses on executive overreach, legal vulnerability, and harm to consumers. Center: Presents legal uncertainty, competing claims, and trade impacts neutrally. Right: Emphasizes presidential trade authority and response to Canadian discrimination.