President Donald Trump’s sweeping use of tariffs faced a storm of questions at the Supreme Court on Wednesday in a case that could reshape presidential authority and global trade policy. Several conservative justices appeared skeptical of the administration’s argument that the import duties were needed to protect American industry and fix trade imbalances.
A coalition of small businesses and several states brought the challenge, claiming Trump exceeded his authority by imposing what they called an unlawful tax. The court’s 6–3 conservative majority usually takes months to decide major cases, but many expect a quicker ruling in this politically sensitive fight over executive power.
Justice Amy Coney Barrett, one of Trump’s own appointees, pressed the administration’s lawyer on the scope of the tariffs. “Is it your contention that every country posed a threat to the defense and industrial base? Spain? France?” she asked. “I can see it with some, but why so many?”
Billions of dollars in tariff payments are on the line. If the administration loses, the government could have to refund vast sums already collected—a situation Barrett warned could become “a complete mess.”
Treasury Secretary Scott Bessent, Commerce Secretary Howard Lutnick, and U.S. Trade Representative Jamieson Greer attended the hearing. Officials insisted they were ready with alternatives if the court ruled against them. “The White House is always preparing for Plan B,” said press secretary Karoline Leavitt before the arguments began.
Later that evening, Trump told Fox News that the hearing went well. He warned that losing the case would be “devastating for the country” and called it “one of the most important cases in U.S. history.”
The Law at the Center of the Battle
The case hinges on the International Emergency Economic Powers Act, or IEEPA, a 1977 law allowing presidents to regulate trade during national emergencies. Trump first invoked it in February to impose tariffs on China, Mexico, and Canada, arguing that drug trafficking from those countries created an emergency.
In April, he expanded the use of the law, ordering tariffs of 10% to 50% on goods from nearly every country. He said the U.S. trade deficit itself was an “extraordinary and unusual threat.” The tariffs took effect gradually as the administration pushed other nations to strike new trade deals.
The administration’s lawyers argued that regulating trade includes the authority to impose tariffs. They said the country faced “unsustainable, country-killing crises” that required swift presidential action. Solicitor General John Sauer warned that overturning Trump’s powers could expose the nation to “ruthless trade retaliation” and “ruinous economic and security consequences.”
Justices Push Back on Presidential Power
The justices’ questions revealed unease about the sweeping powers claimed by the White House. “The justification allows tariffs on any product from any country, in any amount, for any duration,” said Chief Justice John Roberts.
Under the Constitution, Congress—not the president—has the power to tax. The court has long set limits on how much of that authority lawmakers can delegate. Justice Neil Gorsuch asked, “What would stop Congress from handing over all responsibility for regulating foreign commerce?” He admitted he was “struggling” to accept Sauer’s reasoning.
Gorsuch also offered a sharp hypothetical: “Could the president impose a 50 percent tariff on gas-powered cars and auto parts to address the threat of climate change?”
Tariffs or Taxes: The Key Debate
The challengers—states and private companies—argued that IEEPA doesn’t mention tariffs and that Congress never intended to give presidents unlimited trade powers. Neil Katyal, representing small businesses, said the law allowed embargoes or quotas but not tariffs that raise revenue.
The justices spent much of the session analyzing the wording and history of the law. While previous presidents used it to impose sanctions, Trump was the first to apply it to tariffs. Sauer claimed tariffs were “regulatory measures, not taxes.” He said revenue collection was “incidental,” even though Trump often celebrated the billions earned through tariffs.
Justice Sonia Sotomayor dismissed that distinction. “You want to say tariffs aren’t taxes, but that’s exactly what they are,” she said. Justice Brett Kavanaugh added that it seemed illogical to let a president block trade entirely but not impose even a small tariff.
Billions at Stake and Businesses on Edge
Analysts estimate that the case could affect $90 billion in import taxes already paid—nearly half of U.S. tariff revenue collected this year through September. Trump officials warned the amount could reach $1 trillion if the court delays its ruling until June.
The hearing stretched nearly three hours, far longer than expected, drawing a packed audience of lawyers, journalists, and business owners. If the Supreme Court sides with Trump, it will overturn three lower-court rulings that found he exceeded his authority.
Among those listening outside the courthouse was Sarah Wells, founder of Sarah Wells Bags, which designs and imports bags for breast pumps. Her business paid about $20,000 in unexpected tariffs earlier this year and has since halted imports, shifted suppliers, and laid off workers.
After the hearing, Wells felt encouraged. “They seemed to understand the overreach,” she said. “It felt like the justices recognized that this power needs to be restrained.”
