US Supreme Court justices have raised doubts over the legality of President Donald Trump’s sweeping tariffs in a case with implications for the global economy that marks a major test of the president’s powers.

Both conservative and progressive justices sharply questioned the lawyer representing Trump’s Administration about whether the President had intruded on the power of Congress in imposing tariffs under a 1977 law meant for use during emergencies.

But some of the conservative justices also signalled that they were wrestling with their recognition of the inherent power that presidents have in dealing with other countries, suggesting the court could be sharply divided in the outcome of the case.

The court has a 6-3 conservative majority.

During arguments lasting more than two and a h

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