U.S. Secretary of Defense Pete Hegseth stated on March 19, 2026, that Iran has been at war with the United States for 47 years. Speaking at a Pentagon briefing, Hegseth emphasized that Tehran has harbored Islamist militants—Sunni and Shia alike—who target Americans in Iraq, Afghanistan, and other regions. He stressed that this long-standing hostility continues to shape current U.S. military strategy under the Trump administration.

Hegseth highlighted Iran’s historical role in supplying improvised explosive devices (IEDs) during the Iraq War, which contributed to over 600 U.S. troop deaths. The Pentagon briefing framed current operations against Iran as part of a continuation of this persistent threat. Analysts note that this perspective positions U.S. military action as defensive and retaliatory, rooted in decades of Iranian-backed aggression.

The Secretary of Defense further explained that Iran’s willingness to support any group aiming to kill Americans demonstrates a consistent pattern of hostility. From Afghanistan to Iraq and beyond, Tehran’s network of proxies has posed ongoing risks to U.S. personnel. Hegseth argued that acknowledging this historical context is crucial for understanding current military operations.

Current U.S. strategy focuses on neutralizing Iranian capabilities while protecting American forces abroad. Hegseth’s briefing underscores the importance of intelligence, precision operations, and regional partnerships in countering Iran’s multi-decade campaign. By framing the conflict as a continuation of past aggression, the Pentagon reinforces the legitimacy of proactive measures against Iranian threats.

Observers say Hegseth’s remarks serve both as a warning to Tehran and a justification for ongoing military readiness. The briefing reiterates the Trump administration’s commitment to confronting Iran’s longstanding efforts to target Americans, reinforcing the U.S. stance on regional security and counterterrorism.