U.S. Trade Representative Jamieson Greer is urging trade partners to leave their deals unchanged after the Supreme Court dealt a serious blow to President Donald Trump’s tariff authority late last week, possibly imperiling agreements and leaving a messy and unresolved refund process.

“We expect our partners to stand by them,” Greer said on CBS News’s Face the Nation on Sunday. “And I haven’t heard anyone yet come to me and say, ‘The deal’s off.’ They want to see how this plays out.”