US President Donald Trump speaks on the day he honors reigning Major League Soccer (MLS) champion Inter Miami CF players and team officials with an event in the East Room of the White House in Washington, DC, US, March 5, 2026. Photo: REUTERS/Jonathan Ernst

US President Donald Trump said on Wednesday that imports from countries supplying Iran with military weapons will face immediate 50 percent tariffs with no exemptions, announcing the threatened duty in a social media post just hours after agreeing to a two-week ceasefire with Tehran.

Trump’s Truth Social post did not specify which legal authority he would invoke to impose such tariffs, as the Supreme Court in February struck down his use of the International Emergency Economic Powers Act to impose broad global tariffs, prompting a lower court to order refunds of some $166 billion collected over the course of a year.

The 1977 IEEPA law has been used extensively for decades to back financial sanctions against Iran, Russia and North Korea, but the court ruled that Trump overstepped his authority in using it to impose trade tariffs.