The Trump administration said it would ask the US Supreme Court to intervene as soon as Friday if a federal appeals court doesn’t immediately put on hold a decision finding that most of the president’s tariffs are illegal.

In a Thursday court filing in Washington, the Justice Department said the decision a day earlier by the US Court of International Trade harmed the government’s diplomacy and intruded upon President Donald Trump’s exclusive authority to conduct foreign affairs. It asked the US Court of Appeals for the Federal Circuit to put the ruling on hold while the administration pursued a formal appeal.