US President Donald Trump has pledged to impose a 10% “global tariff” under the Trade Act of 1974, after the US Supreme Court ruled his previous duties unlawful.
In a 6–3 decision, the court held that Trump exceeded his authority by using the International Emergency Economic Powers Act (IEEPA) to levy tariffs on dozens of countries.
Writing for the majority, Chief Justice John Roberts said IEEPA does not grant the power to impose tariffs.
Responding to the judgment, Trump called it “deeply disappointing” and said he was “ashamed of certain members of the court”, adding that “other alternatives will now be used”.
Key developments:
• Court blocks most IEEPA-based tariffs; refund question unresolved.
• Justices Clarence Thomas, Samuel Alito and Brett Kavanaugh dissented.
• US effective tariff rate exceeded 10% in 2025 — highest since the Second World War.
ℹ️ The White House, Financial Times
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