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Trump’s tariffs get their day in court

Nov 3, 2025

Trump’s tariffs get their day in court

The backbone of Trump’s trade policy will be put in the hands of nine judges this week. 

Driving the news: A case challenging the legality of Trump’s so-called Liberation Day tariffs will be heard by the U.S. Supreme Court starting Wednesday. At the crux of the case is whether Trump can use a presidential emergency clause to slap tariffs on countries at will. 

Why it matters: A Supreme Court ruling against the Trump administration could make it more difficult for the president to impose tariffs on a whim. Canada’s economy, more than most, has felt the impact of that erratic policymaking. 

  • The Bank of Canada has noted that the uncertainty around tariffs is a major hindrance to Canadian businesses making investment and hiring decisions. 

Catch-up: Trump has leaned on the International Emergency Economic Powers Act (IEEPA) as his primary vehicle for imposing tariffs, declaring different emergencies — from a fentanyl crisis to trade deficits — to bypass Congress, which typically approves tariff policy.

  • Lawyers representing a dozen U.S. states argue that trade deficits — which the U.S. has had for the past 50 years — don't meet IEPPA’s bar of an extraordinary threat.

  • If IEPPA can no longer be used, the president will likely have to turn to more targeted, sector-specific tariffs, which require an investigation to impose. 

Yes, but: While the Supreme Court case could quash the blanket 35% tariffs on Canadian imports, tariffs on specific sectors like autos, lumber, and steel won’t be affected.—LA

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