Washington — A federal appeals court on Thursday sharply probed President Trump's use of an emergency powers law to impose sweeping tariffs on nearly every U.S. trading partner, as higher duties are set to snap into place Friday for countries that have not yet reached trade deals with the administration.

The 11 judges on the U.S. Court of Appeals for the Federal Circuit heard arguments in the Trump administration's appeal of a ruling from a trade-focused lower court that found the president did not have the authority to hit foreign nations with 10% tariffs under the International Emergency Economic Powers Act, or IEEPA.

While a three-judge panel on the U.S. Court of International Trade blocked the sweeping duties that the president assessed on most countries, the Federal Circui

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