Costco is one of dozens of companies suing the Trump administration over its tariffs, seeking both a full refund of tariffs already paid and an end to the ongoing collection of import duties.

The retail giant argued President Donald Trump unlawfully used the International Emergency Economic Powers Act (IEEPA) to impose his tariffs. However, former Washington State Attorney General Rob McKenna noted the Supreme Court case on whether Trump had authority under the IEEPA to impose the tariffs is still pending — so why file the lawsuit now and not wait until after the ruling?

“The answer is one: we don’t know when the Supreme Court’s actually going to rule, even though they took the case on an expedited basis. And two: Costco and the other companies are arguing that there’s a December 15 dead

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