The Supreme Court will hear arguments on November 5th to determine the legality of President Trump enacting tariffs under the International Emergency Economic Powers Act. The high court said earlier this month it would take the case after a lower court ruled Trump did not have the authority to impose most of the tariffs. Supreme Court Agrees To Hear Critical Case Following Trump Administration’s Appeal SCOTUS blog has more: The dispute over Trump’s tariffs is operating on a highly expedited schedule. The government will file its opening brief on Friday, just 10 days after the court announced that it had granted review; the challengers’ briefs will follow just over one month after that. Both sides had urged the court to act quickly. The Trump administration has argued that the ruling by a federal appeals court that the tariffs are unlawful “has disrupted highly impactful, sensitive, ongoing diplomatic trade negotiations,” while the challengers have pointed to the “severe economic hardships” caused by the tariffs. To accommodate the addition of the tariffs dispute to the November argument calendar, the case that had initially been scheduled for Nov. 5 was moved to Nov. 4, and Hamm v. Smith, a death-penalty case that had originally been scheduled for Nov. 4, was taken off the November calendar. It presumably will be rescheduled at a later date. President Trump said tariffs have given his administration great power to negotiate with other countries "who took advantage of us." He also said tariffs have brought in "trillions of dollars." Trump added that we would have to give back trillions of dollars if he loses the Supreme Court case. Footage below: Trump says if he loses the tariff case at the Supreme Court, we would have to give back trillions of dollars to other countries pic.twitter.com/FZ9am0E316 — Acyn (@Acyn) September 12, 2025 Reuters noted: That ruling stemmed from challenges brought by small businesses and by 12 U.S. states - Arizona, Colorado, Connecticut, Delaware, Illinois, Maine, Minnesota, Nevada, New Mexico, New York, Oregon and Vermont - most of them governed by Democrats. The Supreme Court, which begins its next nine-month term on October 6, also agreed to hear at the same time a separate challenge to Trump's tariffs brought by a family-owned toy company, Learning Resources. The tariffs are part of a global trade war instigated by Trump since he returned to the presidency in January that has alienated trading partners, increased volatility in financial markets and fueled global economic uncertainty. Trump has made the levies a key foreign policy tool, using them to renegotiate trade deals, extract concessions and exert political pressure on other countries. The U.S. Court of Appeals for the Federal Circuit in Washington ruled on August 29 that Trump overreached in invoking a 1977 law known as the International Emergency Economic Powers Act, or IEEPA, to impose the tariffs. The tariffs, however, remain in effect during the appeal to the Supreme Court.