Costco has added its voice and heft to a lawsuit against the U.S. government seeking to ensure they will be reimbursed for tariffs they've been forced to pay if the U.S. Supreme Court rejects President Donald Trump's assertion that he has sweeping authority to impose tariffs .

The membership-based warehouse club that sells groceries and a raft of other goods, including clothing and electronics, filed a complaint last Friday in the U.S. Court of International Trade in Manhattan. It stated that Trump's use of the International Emergency Economic Powers Act to impose tariffs left it uncertain whether businesses will be able to recoup sums they should not have paid.

"It's uncertain whether refunds will be granted and, if so, how much," Brent Skorup, a legal fellow at the libertarian Cato I

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