At a rally in Georgia on Thursday night, President Trump declared that he couldn’t wait ‘forever’ for the Supreme Court to rule on the legitimacy of his sweeping tariff policy. Whether or not it was listening to his complaint, forever arrived today as the court handed Trump a thumping defeat. It struck a blow not only for fiscal but also political sanity.

The language of the ruling was as lapidary as it was persuasive. ‘President asserts the extraordinary power to unilaterally impose tariffs of unlimited amount, duration, and scope,’ Chief Justice John Roberts wrote in the 6-3 opinion. ‘In light of the breadth, history, and constitutional context of that asserted authority, he must identify clear congressional authorization to exercise it.’ When he declared ‘Liberation Day’ last April and proclaimed sweeping import duties, Trump pointed to the 1977........

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