In a post on Truth Social, Trump wrote, “It is my great honor to have just signed, from the Oval Office, a Global 10% Tariff on all countries, which will be effective almost immediately.”

“Thank you for your attention to this matter! PRESIDENT DONALD J. TRUMP,” he added.

The announcement comes hours after the Supreme Court of the United States invalidated his earlier tariff regime in a 6–3 ruling.

The decision, authored by Chief Justice John Roberts, found that Trump had exceeded his authority by invoking the International Emergency Economic Powers Act (IEEPA) to impose broad trade tariffs.

The Court stressed that the US Constitution grants Congress — not the president — the power to levy taxes and tariffs, noting that IEEPA was designed for genuine national emergencies rather than routine trade policy.

Three liberal justices joined three conservatives in the majority opinion, while Justices Brett Kavanaugh, Clarence Thomas, and Samuel Alito dissented.

Responding sharply, Trump called the ruling “outrageous” and “a disaster for US workers,” arguing that the tariffs were essential to reducing trade deficits and protecting American industries.

He also indicated that his administration is exploring alternative legal avenues to reimpose tariffs despite the judicial setback.

Trump’s earlier tariffs had reportedly generated more than $133 billion in revenue for the US Treasury, though analysts estimate potential long-term economic costs could reach as high as $3 trillion over the next decade.