Costco is joining other companies that aren't waiting to see whether the Supreme Court strikes down President Donald Trump's most sweeping import taxes. They're going to court to demand refunds on the tariffs they've paid.

The U.S. Court of International Trade and the U.S. Court of Appeals for the Federal Circuit in Washington ruled earlier this year that Trump's biggest and boldest import taxes are illegal. The case is now before the Supreme Court. In a Nov. 5 hearing, several of the high court's justices expressed doubts that the president had sweeping power to declare national emergencies to impose tariffs on goods from almost every country on earth. Advertisement

If the court strikes down the tariffs, importers may be entitled to refunds on the levies they've paid. "It's uncertain w

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