WASHINGTON (AFP)

US President Donald Trump raised the global duty on imports into the United States to 15 percent on Saturday, doubling down on his promise to maintain his aggressive tariff policy a day after the Supreme Court ruled much of it illegal.

Trump said on his Truth Social platform that after a thorough review of Friday's "extraordinarily anti-American decision" by the court to rein in his tariff programme, the administration was hiking the import levies "to the fully allowed, and legally tested, 15% level."

And Trump added that over the next few months, his administration would seek further alternative ways to impose "legally permissible" tariffs.