WASHINGTON (Reuters) -Some plaintiffs could get a refund in certain situations if the U.S. Supreme Court rules against President Donald Trump's tariffs, but the Treasury would have to figure out any payment schedules, the nation's top trade official said on Thursday.

"In some situations, the plaintiffs, specific plaintiffs, will get a refund," U.S. Trade representative Jamieson Greer told Fox Business Network's "Mornings with Maria" program, one day after the top court heard arguments in a major case over Trump's unprecedented use of a law meant for national emergencies to impose costs on imported goods.

"We'll have to figure out, probably with the court, what kind of a schedule might look like, and what the rights are of these parties, and what rights the government has to that money," he added, pointing to the U.S. Department of Treasury.

(Reporting by Susan Heavey and Andrea Shalal; Editing by Ros Russell)