A major retailer has jumped into the escalating court fight over Donald Trump’s tariff regime, seeking to protect itself as the president’s signature trade gambit faces a potentially devastating Supreme Court review.

Costco filed suit in the U.S. Court of International Trade, warning it needs to secure its place in line for refunds if the justices strike down the Trump administration’s sweeping duties imposed under the International Emergency Economic Powers Act.

The move puts the country’s third-largest retailer by revenue alongside a growing roster of industry heavyweights challenging Trump’s fast-moving tariff machine. Revlon Consumer Products Corp. and Kawasaki Motors Manufacturing Corp. have lodged similar cases.

The Supreme Court heard arguments last month on Trump’s so-called re

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