Trump Declares Economic D-Day Against Iran, Threatens Secondary Sanctions

President Donald Trump announced this week that the United States is launching what he called an Economic D-Day against Iran.

In a Truth Social post, Trump said Iran had failed to take the opportunity to make a deal and would face economic warfare and isolation on an unprecedented scale. He ordered that oil smuggling, swap lines, cash transfers, exchange houses, ship registries and front companies must stop immediately.

Any country that allows its financial institutions, businesses, airports or government entities to provide a lifeline to Iran will itself face tremendous economic consequences, he wrote. He called on allies to stand with the United States to isolate and defeat the Iran threat.

Treasury Secretary Scott Bessent said he would hold a news conference on Monday to detail the measures. The campaign builds on Operation Economic Fury, which has already targeted buyers of Iranian oil and related financial networks.

The announcement comes nearly six months into the U.S. and Israeli war with Iran. Talks aimed at reopening the Strait of Hormuz and ending the conflict have stalled. Trump has said there are currently no negotiations under way.

Iranian Foreign Minister Abbas Araghchi dismissed the threat, posting that the so-called Economic D-Day is a diversion from America’s own crisis of unprecedented debt and surging interest costs. He said doubling down on failed policies would bring further defeat and the enmity of Iranians.

Iran has lived under successive rounds of U.S. sanctions for decades. Analysts note that the regime has developed methods to evade restrictions through third countries, front companies and barter arrangements. Secondary sanctions targeting those facilitators form the core of the new pressure campaign.

Oil prices edged higher after the announcement while U.S. equity markets recorded their worst losses in three weeks. The U.S. national debt also crossed $40 trillion in the same period.

Vice President JD Vance described the war as having entered a new phase of economic pressure, saying the administration believes this is the best way to achieve its final objective.

The United States has simultaneously warned allies and China to join the isolation effort, with officials stating the goal is to collapse the regime in Tehran. China remains a major buyer of Iranian oil and has so far shown little sign of reducing purchases.

Whether the intensified financial measures will force a change in Tehran’s position remains uncertain. Previous rounds of maximum pressure produced economic pain but did not compel Iran to abandon its nuclear program or regional activities.