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On Wednesday, the Supreme Court will hear oral arguments in a pair of challenges to President Donald Trump’s move on April 2—or “Liberation Day,” as he proclaimed it —to impose sweeping tariffs on virtually all goods imported into the United States. Although the stakes are huge for the American economy, as well as global trade and foreign policy, the cases have become a vital test of the scope of presidential power to regulate international trade without Congress.

Learning Resources , the plaintiff in this case, is a small, family-owned business that makes educational toys, most of which are produced overseas. The company filed suit in April. The court below

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