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(Bloomberg) — US Supreme Court justices questioned President Donald Trump’s global tariffs, as arguments began in a case that could undercut his signature economic policy.
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Justices including John Roberts and Amy Coney Barrett pressed US Solicitor General D. John Sauer on his contention that a 1977 law designed for emergency situations gives Trump the authority to collect tens of billions of dollars in tariffs a month.
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“The vehicle is imposition of taxes on Americans, and that has always been the core power of Congress,” Roberts said.
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The questioning came early on in a session likely to last more than two hours, and it didn’t give a clear indication of how the court will rule. The justices may have equally tough questions when the tariff challengers make their case in the second half of the argument.
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A ruling against Trump could force more than $100 billion in refunds, remove a major burden on the US importers that are now paying the tariffs, and blunt an all-purpose cudgel the president has wielded against trading partners. More broadly, it would be by far the most significant pushback by the conservative-controlled Supreme Court against Trump’s assertions of powers that go well beyond any claimed by his White House predecessors.
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A Trump victory would potentially set a far-reaching precedent letting presidents take sweeping actions in the name of addressing an emergency they have declared.
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Trump says his tariffs are authorized under the 1977 International Emergency Economic Powers Act, a law that gives the president a panoply of tools to address national security, foreign policy and economic emergencies. The law doesn’t mention tariffs as one of those powers, though a key provision says the president can “regulate” the “importation” of property to deal with a crisis.
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The challenged taxes include Trump’s April 2 “Liberation Day” tariffs, which impose taxes of 10-50% on most US imports depending on the originating country. Trump says those duties are warranted to address the longstanding national trade deficit.
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The high court clash also covers separate tariffs Trump said he imposed on Canada, Mexico and China to address fentanyl trafficking.
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The court is considering two separate lawsuits filed by small businesses along with a third case pressed by 12 Democratic state attorneys general. All three lower courts to have ruled on the issue declared the tariffs to be unlawful.
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—With assistance from Justin Wise.
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