The U.S. supreme court will hear oral arguments on November 5 concerning the legality of Donald Trump’s import tariffs, reports the Guardian.

The court announced earlier this month it would hear the case after a lower appeals court ruled that the U.S. president had overstepped his authority by using a federal law meant for emergencies to impose most of his sweeping and often punitive tariffs on the U.S.’s trading partners. The November hearing will act as a crucial test of the president’s use of executive power to drive through his economic and trade agenda.

More: Watch: How Will the Supreme Court Rule on Trump’s Tariffs?

Trump claimed the August ruling, the result of a challenge by a group of small businesses, “would literally destroy the United States of America” if allowed to stand.

The case was placed on a fast track by the supreme court, which begins its nine-month term next month. The court had also agreed to hear a separate challenge to Trump’s tariffs brought by a family-owned toy company, Learning Resources.