By Zoe Tillman and Jaewon Kang

Costco Wholesale Corp. joined a fast-growing list of businesses suing the Trump administration to ensure eligibility for refunds if the US Supreme Court strikes down the president’s signature global tariffs policy .

The nation’s biggest warehouse club chain is among dozens of companies to file lawsuits in a US trade court since late October challenging President Donald Trump’s use of an economic emergency powers law to impose the levies, according to court records. It’s one of the biggest corporate players to jump into a fight largely driven this year by small businesses and Democratic state officials.

The Supreme Court heard arguments on Trump’s tariffs on Nov. 5. The justices put the fight on a fast-tracked schedule but didn’t say when they intend

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