Costco has said it’s working to mitigate tariffs, which primarily affect its non-food items. Photo by David Zalubowski/AP Photo/Postmedia files

Costco Wholesale Corp. joined a fast-growing list of businesses suing the Trump administration to ensure eligibility for refunds if the United States 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 U.S. 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.

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