Trump’s signature tariffs hang on key question about Congress’ power before Supreme Court

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The Supreme Court is weighing whether to expand presidential power in a case over Donald Trump’s global tariffs, but key constitutional issues could doom the president’s argument.

The high court raised separation of powers concerns during recent oral arguments about the absence of Congress’ role in Trump’s sweeping trade plan, which the president has said is critical to foreign policy and national security and a matter of “life or death” for the country.

Justices across the ideological spectrum peppered Solicitor General John Sauer, the lawyer arguing on behalf of Trump, with questions about whether the president overstepped his authority. They framed their inquiries at times around two legal principles, known as the major questions and non-de