Supreme Court justices appeared skeptical Wednesday of the government's argument that President Trump could bypass Congress to impose tariffs on other countries by using national security as the legal rationale.

Both the court's six conservatives and its three liberals sharply questioned D. John Sauer, the solicitor general, on Trump's use of the International Emergency Economic Powers Act, known as IEEPA.

Lower courts have ruled that Trump exceeded his authority under both the statute and the Constitution.

But the president argues that both allow him to impose tariffs in order to deal with persistent trade imbalances and to stem the flood of fentanyl coming into the United States. Both, he asserts, present national emergencies and pose a threat to national security.

Sauer told the jus

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