【Washington, 】United States: Supreme Court Questions Legality of Tariffs Imposed by Donald Trump

Editor’s Note

This article examines the Supreme Court’s recent scrutiny of tariffs imposed during the Trump administration, highlighting a legal challenge with significant potential implications for trade policy and executive power.

Des manifestants devant la Cour suprême, à Washington, le 5 novembre 2025.
Supreme Court Skepticism

Supreme Court justices on Wednesday, November 5, cast doubt on the legality of tariffs implemented by President Donald Trump, a move that could shake a cornerstone of his economic and diplomatic policy. The hearing, which lasted nearly three hours, took place exactly one year after the election that returned the Republican to the White House, from where he launched an unprecedented protectionist offensive through tariffs.
These taxes on imported goods generate billions of dollars in revenue and have wrested promises of investment and more favorable conditions for American exporters from U.S. partners. The government is keen to prevent this structure from collapsing and is urging the nine Supreme Court justices – six conservatives and three progressives – to uphold them. The Court’s decision could be delivered relatively quickly, perhaps within several months.

Government’s Stance

The government is throwing its full weight into the battle to maintain these tariffs, which Donald Trump asserted on Tuesday were a

“LIFE OR DEATH issue for our country.”

Treasury Secretary Scott Bessent was present at the hearing, an Agence France-Presse journalist noted.
Arguing on behalf of the executive branch, legal counsel John Sauer laid out his arguments at full speed. He notably contended that repealing the tariffs

“would expose us to ruthless trade retaliation”

from other countries.

“National Emergency” Debate

Several justices expressed skepticism, particularly regarding the use of the 1977 International Emergency Economic Powers Act (IEEPA), invoked by the Republican president to unilaterally decree several rounds of tariffs on the grounds that the U.S. trade deficit, though chronic for decades, constituted a

“national emergency.”

He thus arrogated the power to increase or reduce them at his discretion.
But this law does not mention the power to impose tariffs, only the power to

“regulate imports and exports.”
“Taxation is a legislative power (…), tariffs are taxes,”

stated progressive Justice Sonia Sotomayor.
Conservative Chief Justice John Roberts observed that the IEEPA text

“is being used to impose tariffs on any product, any country of origin, choosing the amount and the duration,”
Des manifestants devant la Cour suprême, à Washington, le 5 novembre 2025.

noting that this seemed to confer

“major authority”

on the president.
Since his return to the White House in January, the head of state has made tariffs a major lever of his economic and diplomatic policy. He boasts that through this pressure tactic, he can not only reindustrialize the country and reduce its chronic trade deficit but also – by imposing taxes on Mexico, Canada, and China – curb the fentanyl crisis, a powerful opioid that kills tens of thousands of Americans from overdose each year.

“A Power No President Has Ever Had”

Before the case reached the Supreme Court, several federal courts had declared these tariffs – distinct from those targeting specific sectors like automobiles or steel – illegal. They nevertheless remained in effect pending a ruling from the nation’s highest court.
Small business owners and Democratic states brought the case to court, arguing that the president could not thus encroach on Congress’s prerogatives to impose taxes affecting the lives of both businesses and American consumers.
The twelve involved Democratic states pointed out,

“It is Congress, not the president, who decides whether and how much to tax Americans who import goods,”

exhorting the Court not to allow him to

“arrogate this power.”
“Taxing tomatoes does not ‘solve’ the fentanyl crisis.”

Businesses’ attorney, Neal Katyal, argued,

“They are imposing tariffs on the whole world in peacetime. And they are doing it by granting themselves a power that no president has ever had in our entire history.”

He expressed particular surprise that Swiss products were subject to a 39% surcharge.
Justice Samuel Alito, appointed by a Republican president, questioned,

“Why would Congress”

allow the U.S. president

“to impose a quota, a ban, but not a tariff?”

The Court must also rule on other questions concerning the extent of presidential powers, particularly regarding the removal of heads of independent agencies, especially at the Federal Reserve (Fed, central bank).

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⏰ Published on: November 05, 2025