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Roberts rejected that interpretation outright.
The president had leaned on “regulate” and “importation” — two words “separated by 16 others” — to claim authority to impose tariffs on “any country, of any product, at any rate, for any amount of time.”
“Those words cannot bear such weight,” Roberts wrote.
The decision effectively shuts down one legal pathway the administration used to justify tariffs under a declared national emergency tied to long-running trade deficits.
WATCH:
But conservatives arguing the ruling cripples Trump’s economic agenda may be overstating the damage.
According to George Washington University law professor Jonathan Turley, the administration still has options.
“The administration has other tools in its toolbox. It can actually impose tariffs under other statutes,” Turley explained, signaling that this fight is not over. He added that there remains “plenty of runway” for the White House to pursue trade actions through different legal mechanisms.
Meanwhile, the dissenting justices warned of chaos stemming from the Court’s move.
Justice Brett Kavanaugh sounded the alarm over what could come next in lower courts.
“The United States may be required to refund billions of dollars to importers who paid the IEEPA tariffs, even though some importers may have already passed on costs to consumers or others,” Kavanaugh wrote. “As was acknowledged at oral argument, the refund process is likely to be a ‘mess.’”
That issue — refunds — was notably left unresolved by the majority opinion, opening the door to additional litigation and financial uncertainty.
The administration has consistently argued that the IEEPA gives the president flexibility to respond to what it calls “unusual and extraordinary threats” when a national emergency is declared.
President Trump has maintained that decades of deep and persistent trade deficits amount to exactly that kind of emergency, one severe enough to justify aggressive tariff action.
The Department of Justice urged the Court to preserve that authority, warning that denying such powers “would leave our country open to trade retaliation without effective defenses.”
Opponents countered that no president in the half-century since IEEPA’s passage has used it to impose tariffs. They argued that labeling a decades-old trade imbalance as an “unusual and extraordinary” emergency stretches the statute beyond recognition.
Lower courts had already expressed skepticism.
The U.S. Court of International Trade ruled unanimously last year that the president does not possess “unbounded authority” under the emergency law to enact tariffs without Congress. The Federal Circuit echoed that conclusion on appeal.
Friday’s Supreme Court ruling now cements that interpretation at the highest level.
Yet the broader debate remains unresolved.
Does the Constitution require Congress to remain firmly in control of tariff policy? Or does modern economic warfare demand more flexible executive power?
The Court has answered one narrow legal question. But as Turley and others have noted, alternative statutory routes remain open.
The tariff fight may have lost one battlefield.
The trade war, however, is far from over.
