Major retailer Costco challenges Trump tariff legality in federal court. Company faces critical December deadline that could lock in payments forever.

Experts say Costco's challenge could set a major precedent on presidential tariff powers and reshape U.S. trade authority.

Costco's lawsuit against the president's signature economic policy has sowed discord among its unusually loyal membership.

With 19 Arizona stores, Costco is challenging Trump-era tariffs. Here’s what to know about the case and its impact on shoppers.

Costco is suing to secure a "complete refund" should the Supreme Court strike down many of Trump's tariffs. Small businesses ...

Retail giant Costco is suing the Trump administration over its sweeping tariffs. In a federal lawsuit, the company argues the president exceeded his authority when he imposed his extensive tariffs on ...

Costco has filed a federal lawsuit against the Trump administration seeking a full refund on tariffs if the Supreme Court strikes them down ...

It will mark Costco’s first comprehensive public explanation of why it chose to challenge the administration’s trade policy ...

In a complaint submitted Friday, the retailer said it is seeking a "full refund" of duties it paid after Trump levied tariffs.

Even with inflation cooling, prices remain well above pre-pandemic levels, giving warehouse clubs a bigger role in helping ...

The retailer becomes the largest company to sue over the administration’s trade policy.