.......  Costco is now one of the largest companies to sue the Trump administration over tariffs, hoping to secure a refund if the Supreme Court declares the new import duties illegal.

The Supreme Court is weighing the future of President Trump's tariffs on nearly all imports. Justices seemed skeptical about the tariffs' legality during last month's oral arguments. Lower courts had previously found that Trump had improperly used emergency economic powers to set most of the new levies.   .........

...........  "This is the first time we're seeing big companies take their heads out of the sand publicly," said Marc Busch, a trade law expert at Georgetown University. For the most part, small companies have been leading the legal action against tariffs, he said, adding, "It's nice to finally see some heavyweights joining in the fray."....