The US Supreme Court Wednesday appeared sceptical of President Donald Trump’s sweeping global tariffs under an emergency authority, in a landmark case that could redefine presidential powers over trade.

The nine justices weighed whether Trump lawfully used the International Emergency Economic Powers Act (IEEPA) of 1977 to levy tariffs on imports from more than 100 countries, measures that have reshaped global commerce, raised prices for US consumers, and provoked retaliation from trading partners.

The dispute stems from two lawsuits filed by 12 US states, led by Oregon, and several small businesses, which argue that the IEEPA does not authorise a President to impose tariffs unilaterally. They contend that the power to tax imports rests solely with Congress, under the US Constitution’s se

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