Donald Trump has heaped pressure on the Supreme Court to preserve his tariff regime. Photo: AP PHOTO

The US Supreme Court is due to hear arguments over the legality of Donald Trump's sweeping tariffs in a case with implications for the global economy that marks a major test of the Republican president's powers and the willingness of the justices to let him push the limits of his authority.

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The arguments are set to begin on Wednesday after lower courts ruled that Trump's unprecedented use of a 1977 federal law meant for national emergencies to impose the tariffs exceeded his authorit

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