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The U.S. Supreme Court said President Trump’s tariffs policies imposed under the International Emergency Economic Powers Act (IEPPA) are unconstitutional, dealing a major blow to the president’s signature economic policy.

Chief Justice John Roberts wrote the 6-3 opinion. Justices Clarence Thomas, Samuel Alito and Brett Kavanaugh dissented.

Writing for the court’s majority, Chief Justice John Roberts said Trump lacked the peacetime authority to use IEPPA to pose tariffs.

“In light of the breadth, history, and constitutional context of that asserted authority, he must identify clear congressional authorization to exercise it,” Robert wrote, concluding Trump has not.

Trump had argued persistent trade imbalances and the flood of fentanyl coming into the country presented national emergencies and pose a threat to national security.

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