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.

Dozens of companies across industries have filed lawsuits to seek refunds in the event that the Supreme Court finds Trump's tariffs illegal. The list includes makeup giant Revlon, canned-foods maker Bumble Bee and Kawasaki, which makes motorcycles and more. Now Costco has joined the queue.

"This is the first ti

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