Supreme Court justices on Wednesday morning expressed skepticism about the legality of aggressive tariffs imposed by President Donald Trump against most of the world's nations.

Conservative and liberal justices sharply questioned Solicitor General D. John Sauer on the Trump administration's method for enacting the tariffs, which critics say infringes on the power of Congress to tax.

Lower federal courts have ruled that Trump lacked the legal authority he cited under the International Emergency Economic Powers Act to impose the so-called reciprocal tariffs on imports from many U.S. trading partners, and fentanyl tariffs on products from Canada , China and Mexico.

Sauer, who is defending the tariff policy as grounded in the power to regulate foreign commerce, said "these

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