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The Supreme Court held an opinion day Jan. 9, but no decision came on the legality of the president’s sweeping levies imposed under the International Emergency Economic Powers Act. 

Costco is one of the biggest corporate players to jump into a challenge of the Trump administration's tariffs largely driven this year by small businesses and Democratic state officials.

Wall Street heavyweights have struck deals with companies that could be eligible for reimbursement if tariffs are ruled unlawful, yet investors are finding the trade can be had for relatively cheap.

The administration is trying to defend the tariffs after lower courts ruled the emergency law Trump invoked doesn’t give him near-limitless power to set and change duties on imports.

Trump had said he wanted to take the highly unusual step of attending the arguments in person, but on Nov. 2 said he had ruled it out, saying he didn't want to be a distraction.

Small businesses challenging many of President Trump’s tariffs urged the Supreme Court to affirm lower-court rulings that the import levies are a massive illegal tax on American companies.

Presidential visits during oral arguments are rare, but President Trump considers this "one of the most important cases ever brought, because we will be defenseless," without tariffs.

The Supreme Court on Sept. 9 granted an unusually quick hearing on whether President Donald Trump has the power to impose sweeping tariffs under federal law.

The appeal calls for putting the case on a highly expedited schedule with arguments in early November, according to filings reviewed by Bloomberg.

“If we don’t win that case, our country is going to suffer so greatly,” Trump told reporters in the Oval Office. “These deals are all done; I guess we’d have to unwind them.”