Treasury official warns of widespread economic damage if Supreme Court rules against Trump’s tariffs

Treasury official warns of widespread economic damage if Supreme Court rules against Trump’s tariffs

Treasury official warns of widespread economic damage if Supreme Court rules against Trump’s tariffs

The Trump administration is warning that if the Supreme Court were to dismantle President Trump’s tariffs, it would cause “unnecessary economic pain and hardship,” damaging financial markets and confidence.

“To the extent that the policy would be reversed or watered down, that would damage financial markets,” Counselor to the Treasury Secretary Joe Lavorgna said this week in an interview with Yahoo Finance. “You’ve seen record high equity markets, record low credit spreads. You’ve seen commitments by all different countries and companies to invest in the US.”

“It would damage confidence. The economic system — capitalism — works on confidence,” he added.

While economists acknowledge it could lead to greater uncertainty, they and others say the impact of a ruling against Trump could have other impacts — including positive ones.

Trump has invoked authorities under the International Emergency Economic Powers Act (IEEPA) to levy blanket tariffs on goods from other countries to try to bolster national security and the economy, address what he views as trade imbalances, and reduce the US deficit.

WASHINGTON, DC - OCTOBER 16: Joe Lavorgna, Counselor to the Secretary, US Treasury Department, speaks onstage during the Semafor World Economy Summit Fall Edition at Gallup HQ on October 16, 2025 in Washington, DC.  (Photo by Paul Morigi/Getty Images for Semafor )
Counselor to the Treasury Secretary Joe Lavorgna speaks onstage during the Semafor World Economy Summit Fall Edition at Gallup HQ on Oct. 16 in Washington, D.C. (Paul Morigi/Getty Images for Semafor ) · Paul Morigi via Getty Images

The Supreme Court is now weighing whether the president has the legal authority to issue tariffs using these authorities, given that Congress is the branch of government tasked with taxation and spending —the so-called power of the purse — not the executive branch.

Gregory Daco, chief economist for EY-Parthenon, said a permanent and immediate reversal of the IEEPA-based tariffs would “significantly” reverse pressure from tariffs on the economy, cutting his estimated hit to GDP by nearly 60%, from 1% to around 0.4%.

“But the real catalyst for restoring confidence lies in the permanence and clarity of the policy shift,” Daco said. “Without that, businesses will remain cautious, trade flows will stay disrupted, and the potential economic gains will be considerably diminished.”

The US has collected $225 billion in tariffs over the past year, $145 billion more than the previous year. Daco estimates a full reversal of the IEEPA tariffs could imply over $85 billion in tax rebates or reimbursements. He cautioned that unless a reversal is seen as durable, the resulting uncertainty will continue to weigh on investment decisions and global supply chains, muting any positive impact from a reversal of tariffs.

Read more: What Trump’s tariffs mean for the economy and your wallet

Luke Tilley, chief economist for Wilmington Trust, said a reversal of the IEEPA tariffs would have “profound implications for the outlook,” notably that it would extend the already elevated uncertainty that is keeping many businesses from hiring or making new capital investments.

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