President Donald Trump asked the US Supreme Court to turn away a challenge to his sweeping tariffs, telling the justices they should let the legal fight develop before getting involved.

The U.S. Constitution gives the power to impose taxes — including tariffs — to Congress. But lawmakers have gradually relinquished power over trade policy to the White House. And Trump has made the most of the power vacuum, raising the average U.S. tariff to more than 18%, highest since 1934, according to the Budget Lab at Yale University.

Back in May, the U.S. Court of International Trade ruled that Trump overstepped his bounds by using IEEPA to apply tariffs. Just a day later, the decision was paused and tariffs were back on. The lawsuit was brought by a wine importer called V.O.S. Selections and four other small businesses. Analysts expect the case to reach the Supreme Court.