U.S. President Donald Trump announced a new 10% tariff on most imported goods for 150 days after the Supreme Court ruled he lacked the authority to set tariffs unilaterally, Reuters reports. The White House said certain critical items, including minerals, metals, and energy products, were exempted.

The 6-3 decision, authored by Chief Justice John Roberts, struck down Trump’s previous tariffs, questioning the administration’s interpretation of the International Emergency Economic Powers Act (IEEPA). Roberts cited the Constitution, noting that “Congress shall have Power To lay and collect Taxes, Duties, Imposts and Excises,” and rejected the argument that the president could invoke a national emergency to impose duties of unlimited scope or duration, Reuters reports.

Hours after the ruling, Trump signed an executive order repealing the previously challenged tariffs and simultaneously issued the new proclamation to implement the 10% levy. The move comes amid questions over roughly 175 billion US dollars collected from importers under the prior tariffs, which the court found were imposed without legal authority.

Trump sharply criticised individual justices, telling reporters, “I’m ashamed of certain members of the court, absolutely ashamed, for not having the courage to do what’s right for our country.” He further suggested, without evidence, that foreign influence had swayed the majority. “They’re very unpatriotic and disloyal to our Constitution,” he said, Reuters notes.

The Supreme Court ruling temporarily boosted U.S. stock indexes before gains tapered, as analysts warned that global markets face uncertainty while investors assess the administration’s next moves in the trade war. Trump indicated he intends to continue using alternative measures to exert trade leverage. “It’s ridiculous, but it’s OK, because we have other ways, numerous other ways,” he told reporters.

Since returning to the White House 13 months ago, Trump has asserted what the court described as “extraordinary power to unilaterally impose tariffs of unlimited amount, duration, and scope.” His administration maintained that IEEPA permitted broad tariff actions during peacetime; the court disagreed, stating, “The Government thus concedes, as it must, that the President enjoys no inherent authority to impose tariffs during peacetime… The United States, after all, is not at war with every nation in the world,” Reuters reports.

The ruling also casts uncertainty over recent trade deals negotiated under the threat of high tariffs, leaving unresolved the legality of duties previously collected from foreign exporters.