Canada’s hope to constrain Trump’s tariff agenda shifts to America’s top court

Even if the U.S. Supreme Court strikes down President Donald Trump's use of IEEPA tariffs, there are other levying authorities he can use in their place, say international trade lawyers.

Prime Minister Mark Carney, left, speaks with U.S. Trade Representative Jamieson Greer in the White House on Oct. 7. A portrait of former U.S. president Ronald Reagan hangs in the background. White House photograph by Daniel Torok

News

BY NEIL MOSS

October 29, 2025

With another pause in cross-border trade talks, an upcoming United States Supreme Court case could diminish the pace of President Donald Trump’s tariff agenda.

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