Washington — The Supreme Court is considering Wednesday whether President Trump can unilaterally impose tariffs on nearly every country under a federal emergency powers law, with the justices poised to test a centerpiece of his economic agenda and the limits of presidential powers.

The court fight over Mr. Trump's sweeping tariffs marks the first in which the Supreme Court weighs the legal merits of one of the president's signature policies implemented in his second term.

Three lower courts have concluded that most of the president's tariffs are illegal, and a ruling from the Supreme Court upholding those decisions would deal a blow to Mr. Trump's plans to use tariffs as leverage to push U.S. trading partners to negotiate better trade deals. The president has also claimed that tarif

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