Retail giant Costco just filed a lawsuit against the current administration, aiming to claw back money if the Supreme Court strikes down Trump's controversial tariff strategy. The case centers on his use of a decades-old 1977 statute to slap duties on multiple countries without Congressional approval. If the justices rule those levies unconstitutional, Costco wants its cash back—and they're probably not the only ones. This could ripple through corporate balance sheets and shake up how trade wars get fought going forward. Big money, big stakes.