Trump tariffs head to Supreme Court in case eagerly awaited around the world

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What may be the biggest battle yet in Donald Trump's trade war is getting under way.

The US Supreme Court is hearing arguments over the legality of the Trump administration's tariffs, as a number of small businesses and a group of states contend most of them are illegal and should be struck down.

If the court agrees with them, Trump's trade strategy would be upended, including the sweeping global tariffs he first announced in April. The government would also likely have to refund some of the billions of dollars it has collected through the tariffs, which are taxes on imports.

Following Wednesday's hearing, the justices will pore over the arguments and discuss the merits of the case, which could take months. Eventually they will hold a vote.

Trump has described the fight in epic terms, warning a loss would tie his hands in trade negotiations and imperil national security.

On Sunday, the president said he would not attend the hearing in person as he did not want to cause a distraction.

"I wanted to go so badly... I just don't want to do anything to deflect the importance of that decision," he said. "It's not about me, it's about our country."

Trump previously said that if he does not win the case the US would be "weakened" and in a "financial mess" for many years to come.

The stakes feel just as high for many businesses in the US and abroad, which have been paying the price while getting whipped about by fast-changing policies.

Trump's tariffs will cost Learning Resources, a US seller of toys made mostly overseas and one of the businesses suing the government, $14m (£10.66m) this year. That is seven times what it spent on tariffs in 2024, according to its CEO Rick Woldenberg.

"They've thrown our business into unbelievable disruption," he said, noting the company has had to shift the manufacturing of hundreds of items since January.

Few businesses, though, are banking on a win at the court.

"We are hopeful that this is going to be ruled illegal but we're all also trying to prepare that it's setting in," said Bill Harris, co-founder of Georgia-based Cooperative Coffees.

His co-op, which imports coffee from more than a dozen countries, has already paid roughly $1.3m in tariffs since April.

A test to Trump's presidential power

In deciding this case, the Supreme Court will have to take on a broader question: How far does presidential power go?

Legal analysts say it is hard to predict the justices' answer, but a ruling siding with Trump will give him and future White House occupants greater reach.

Specifically, the case concerns tariffs that the Trump administration imposed using the 1977 International Emergency Economic Powers Act (IEEPA), which the White House has embraced for its speed and flexibility. By declaring an emergency under the law, Trump can issue immediate orders and bypass longer, established processes.

Trump first invoked the law in February to tax goods from China, Mexico and Canada, saying drug trafficking from those countries constituted an emergency.

He deployed it again in April, ordering levies ranging from 10% to 50% on goods from almost every country in the world. This time, he said the US trade deficit - where the US imports more than it exports - posed an "extraordinary and unusual threat".

Those tariffs took hold in fits and starts this summer while the US pushed countries to strike "deals".

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