New Delhi, March 5 -- A federal trade court judge has ordered U.S. Customs officials to stop calculating tariffs imposed under emergency powers by President Donald Trump, clearing the way for a sweeping refund process after the Supreme Court ruled the duties unlawful.

In a ruling issued Wednesday, Judge Richard Eaton of the U.S. Court of International Trade directed Customs and Border Protection to halt a key step in the tariff accounting process tied to duties imposed under the International Emergency Economic Powers Act (IEEPA). The order is intended to simplify refunds for importers who paid the now-invalid levies.

The decision follows the Supreme Court's 6-3 ruling on February 20, which found that Trump lacked authority to impose sw...