Costco has sued the U.S. government in an effort to secure potential refunds should the Supreme Court reject President Donald Trump’s bid for broad authority to impose tariffs. In a complaint filed Friday in the U.S. Court of International Trade in Manhattan, the retailer said Trump’s use of the International Emergency Economic Powers Act to levy tariffs has created uncertainty over whether companies can reclaim duties they should not have been required to pay. Costco, the country’s largest