Justices question whether sweeping import duties violate Congress’s constitutional power to tax as the administration warns of $750 billion refund risk.
WASHINGTON, D.C. (Market Insider) — U.S. Supreme Court justices from across the ideological spectrum expressed deep skepticism Wednesday over the legality of the U.S President Donald Trump’s global tariff program, suggesting that the White House may have overstepped its constitutional authority by unilaterally imposing taxes on imports under the International Emergency Economic Powers Act (IEEPA).
Both liberal and conservative justices pressed Solicitor General D. John Sauer, who defended the administration’s position that the tariffs were “regulatory measures” rather than taxes. The policy, first implemented in 2024, imposed baseline tariffs of 10% on goods from most nations — rising to 50% on imports from India and Brazil — as part of Trump’s campaign to address trade imbalances and combat fentanyl smuggling.
But lower federal courts previously ruled that Trump lacked legal authority under IEEPA, which was enacted in 1977 to allow the president to impose economic sanctions in national emergencies — not to set nationwide tax policy.
“Tariffs Are Taxes”
Justice Sonia Sotomayor was blunt in her challenge: “You say tariffs are not taxes, but that’s exactly what they are. They’re generating money from American citizens — revenue.” She emphasized that no U.S. president before Trump has ever used IEEPA to impose tariffs.
Conservative Justice Neil Gorsuch echoed those concerns, warning of the constitutional dangers of unchecked executive power. “What happens when the president simply vetoes legislation to take these powers back?” Gorsuch asked. “Congress, as a practical matter, can’t reclaim them — it’s a one-way ratchet of power toward the executive branch.”
A Divided Bench, but Common Concern
Other conservative justices, including Chief Justice John Roberts and Justices Amy Coney Barrett, Brett Kavanaugh, and Samuel Alito, also pressed Sauer on whether Trump’s broad interpretation of IEEPA violated the separation of powers by undermining Congress’s sole authority to levy taxes.
Sauer maintained that the tariffs were designed to regulate trade rather than raise revenue. “These are regulatory tariffs. The fact that they raise money is only incidental,” he said.
Billions at Stake
If the court rules the tariffs unlawful, the federal government could be forced to refund more than $750 billion in collected duties, according to Treasury Secretary Scott Bessent. The Committee for a Responsible Federal Budgetestimates that U.S. customs duty revenue has already surged nearly 300% year-on-year, reaching $151 billion in the second half of fiscal 2025 alone.
The plaintiffs — a coalition of importers and manufacturers led by Learning Resources CEO Rick Woldenberg — argue that Trump’s actions amounted to an unconstitutional tax grab disguised as trade policy. Representing them before the court, Neal Katyal, former U.S. Solicitor General, asserted:
“Tariffs are taxes. Our founders gave that taxing power to Congress alone. No president has ever used emergency powers to rewrite the world’s tariff architecture.”
Katyal also pointed out inconsistencies in the administration’s justification, noting that Trump imposed a 39% tariff on Swiss imports, despite the U.S. running a trade surplus with Switzerland — calling it “a clear misuse of emergency powers.”
Broader Implications
The case represents one of the most consequential legal tests of Trump’s second term and could redefine the limits of presidential authority over trade policy. A ruling against the administration might curb the White House’s ability to unilaterally impose tariffs without congressional approval.
While the Supreme Court’s decision is not expected immediately, the Trump administration has requested an expedited ruling given the potential economic impact.
Bessent, who attended the hearing, later praised Sauer’s defense on social media, saying the arguments “demonstrated the necessity of using IEEPA to confront global trade emergencies,” while accusing opposing counsel of “fundamental economic misunderstandings.”
What’s Next
The justices heard more than two and a half hours of arguments but gave no clear indication of when a ruling might be issued. Analysts say the outcome could reshape the balance of power between Congress and the presidency — and determine whether Trump’s aggressive use of tariffs becomes a lasting feature of U.S. trade policy or a constitutional overreach overturned by the nation’s highest court.
