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The Supreme Court will weigh the legality of President Donald Trump’s use of an emergency law to unilaterally impose sweeping tariffs on most U.S. trading partners on Wednesday — a blockbuster case, and one that experts say stretches far beyond matters of economic policy.

At issue before the court is whether the president can use the International Emergency Economic Powers Act (IEEPA) to impose two sweeping sets of tariffs on most countries, including a 10% global tariff Trump announced in April and the higher so-called reciprocal tariffs imposed on nearly 50 countries. Trump said at the time that trade deficits amounted to “the precipice of an economic and national-security crisis” sufficient to trigger his powers under IEEPA.

The two consoli

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