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.

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 authority.

The challenge involves three lawsuits brought by businesses affected by the tariffs and 12 US states, most of them Democratic-led.

Trump has heaped pressure on the Supreme Court, which has a 6-3 conservative majority, to preserve tariffs that he has leveraged as a key economic and foreign policy tool.

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