The Supreme Court on Wednesday confronted President Donald Trump’s sweeping use of tariffs, questioning whether he overstepped his authority in a case that could reshape the limits of presidential power and alter global trade relations. Several conservative justices expressed doubts about the administration’s defense of the import duties, which Trump said were necessary to restore U.S. manufacturing and correct trade imbalances.
A coalition of small businesses and multiple states challenged the measures, arguing that the president imposed what amounted to an unconstitutional tax. With the court’s 6–3 conservative majority, decisions typically take months, but many observers expect a faster ruling given the political and economic stakes.
Justice Amy Coney Barrett, appointed by Trump, pressed the administration’s lawyer on the scope of the tariffs. “Do you mean to say that every country posed a threat to our defense and industrial base? Spain? France?” she asked. “I can see it with some, but not all.”
Billions of dollars are on the line. If the administration loses, the federal government might have to refund large sums already collected. Barrett warned the process could become “a complete mess.”
Top economic officials, including Treasury Secretary Scott Bessent, Commerce Secretary Howard Lutnick, and U.S. Trade Representative Jamieson Greer, attended the hearing. Beforehand, press secretary Karoline Leavitt said, “The White House is always preparing for Plan B.”
Later that day, Trump told Fox News the hearing “went very well,” warning that a loss would be “devastating for the country.” He called it “one of the most important cases in American history.”
The Emergency Law Driving the Dispute
At the center of the case lies the International Emergency Economic Powers Act (IEEPA), a 1977 law that allows presidents to regulate trade in times of national emergency. Trump first invoked it in February to impose tariffs on China, Mexico, and Canada, claiming that drug trafficking from those countries posed an emergency.
Two months later, he broadened the policy, levying tariffs ranging from 10% to 50% on imports from nearly every country. He argued that America’s trade deficit itself represented an “extraordinary and unusual threat.” The measures took effect in phases as Washington pushed foreign governments to negotiate new deals.
The administration argued that regulating trade includes the power to impose tariffs. Solicitor General John Sauer defended Trump’s actions, warning that a ruling against him could expose the U.S. to “ruthless trade retaliation” and “ruinous economic and security consequences.” He described the crises as “country-killing and unsustainable.”
Justices Question the Boundaries of Presidential Power
Several justices raised concerns about the scale of authority the administration claimed. “This justification allows tariffs on any product, from any country, in any amount, for any period,” said Chief Justice John Roberts.
Under the Constitution, Congress—not the president—holds the power to tax. The court has long emphasized limits on how much power lawmakers can delegate. Justice Neil Gorsuch asked, “What would stop Congress from handing over all responsibility for foreign commerce?” He admitted he was “struggling” to accept the government’s argument.
Gorsuch also presented a hypothetical scenario: “Could the president impose a 50 percent tariff on gas-powered cars to address the extraordinary threat of climate change?”
Are Tariffs Really Taxes?
Lawyers for the opposing states and private groups argued that IEEPA does not authorize tariffs and that Congress never intended to give presidents open-ended trade powers. Neil Katyal, representing small businesses, said the law allowed embargoes or quotas—but not revenue-raising tariffs.
The justices spent much of the hearing examining the text and history of IEEPA. While previous presidents used it to impose sanctions, Trump was the first to apply it to tariffs. Sauer insisted tariffs were “regulatory tools, not taxes,” claiming that revenue collection was “incidental,” despite Trump’s frequent boasts about tariff income.
Justice Sonia Sotomayor rejected that claim. “You say tariffs aren’t taxes, but that’s exactly what they are,” she said. Justice Brett Kavanaugh added that it made little sense to let the president block trade entirely but not impose even a small tariff.
Massive Economic Stakes for Businesses
The ruling could affect $90 billion in import taxes already paid—nearly half of U.S. tariff revenue through September, according to analysts. Administration officials warned the figure could soar to $1 trillion if the court delays its decision until June.
The hearing lasted almost three hours—far longer than scheduled—and drew a full house. If the Supreme Court sides with Trump, it would overturn three lower-court decisions that ruled against the administration.
Among those watching from outside the court was Sarah Wells, founder of Sarah Wells Bags, which designs and imports bags for breast pumps. Her company paid about $20,000 in tariffs this year before halting imports, shifting suppliers, and laying off staff.
After the hearing, Wells said she felt optimistic. “They seemed to recognize the overreach,” she said. “It felt like the justices understood that this power has to be restrained.”
