Retired U.S. Navy Admiral Weighs In on Trump’s Threat to Blockade the Strait of Hormuz

President Donald Trump’s threat to impose a naval blockade on the Strait of Hormuz — one of the world’s most strategically vital maritime chokepoints — has drawn sharp scrutiny from military experts, including retired U.S. Navy Admiral James Foggo, dean of the Center for Maritime Strategy. The proposal, aimed at pressuring Iran over its nuclear program, raises profound questions about international law, global energy markets, and the risk of military escalation in one of the most volatile regions on Earth.

The Strait of Hormuz has long been considered the single most important chokepoint in global energy infrastructure. Bordered by Iran to the north and Oman and the United Arab Emirates to the south, it connects the Persian Gulf — home to the oil exports of Saudi Arabia, Iraq, Kuwait, Qatar, Bahrain, and the UAE — to the Gulf of Oman and the broader Indian Ocean. The U.S. Navy’s Fifth Fleet, headquartered in Bahrain, has maintained a continuous presence in the region for decades, tasked specifically with ensuring the free flow of maritime commerce through these waters. Any disruption to traffic through the Strait has historically sent global oil prices surging; even threats of closure by Iran during past tensions have triggered market volatility. Admiral Foggo, who commanded NATO’s Allied Joint Force Command Naples and served as commander of U.S. Naval Forces Europe and Africa before his retirement, brings decades of operational experience to the discussion. His assessment underscores the enormous logistical and military commitment a blockade would require — not merely stationing warships, but sustaining a round-the-clock interdiction operation in waters where Iran possesses significant asymmetric capabilities, including fast-attack boats, anti-ship cruise missiles, naval mines, and submarine forces.

The legal and diplomatic dimensions of a blockade are equally complex. Under longstanding principles of international law, a naval blockade constitutes an act of war. The United States has not formally declared war on Iran, and there is no existing Authorization for Use of Military Force (AUMF) that explicitly covers such an operation against Tehran. Constitutional scholars and legal experts have noted that implementing a blockade without congressional approval could provoke significant legal challenges, as well as fracture the already delicate diplomatic landscape surrounding Iran nuclear negotiations. Furthermore, because the Strait carries oil bound for U.S. allies — Japan imports approximately 80% of its crude oil through the waterway, and South Korea roughly 70% — a blockade designed to punish Iran could inflict severe collateral economic damage on friendly nations. European allies, already navigating their own energy security challenges in the aftermath of the Russia-Ukraine conflict, could face additional supply disruptions. China, which is Iran’s largest oil customer, would also be directly affected, adding another layer of great-power competition to the equation.

Iran’s own military posture adds significant risk to any blockade scenario. The Islamic Revolutionary Guard Corps Navy (IRGCN) has spent years developing asymmetric warfare capabilities specifically designed to threaten larger conventional navies operating in confined waters. Iran’s arsenal includes thousands of naval mines — historically one of the most cost-effective and dangerous weapons in maritime warfare — as well as shore-based anti-ship missile batteries capable of targeting vessels throughout the Strait. During the 1980s “Tanker War” phase of the Iran-Iraq conflict, Iranian mines damaged the USS Samuel B. Roberts, and U.S. forces responded with Operation Praying Mantis, the largest American naval engagement since World War II. More recently, in 2019, Iran shot down a U.S. surveillance drone over the Strait and was accused of conducting limpet mine attacks on commercial tankers, incidents that brought the two nations to the brink of open conflict.

Looking ahead, the feasibility and consequences of a Hormuz blockade will likely remain a focal point of congressional debate, allied consultations, and military planning discussions. Defense analysts note that the U.S. Navy, while the most powerful maritime force in the world, is simultaneously contending with rising operational demands in the Indo-Pacific, the Red Sea — where Houthi attacks on shipping have required sustained naval deployments — and the European theater. Diverting significant naval assets to enforce a prolonged blockade in the Persian Gulf could strain readiness elsewhere. Congressional leaders from both parties will face pressure to assert their constitutional war powers authority if the administration moves beyond rhetoric toward operational execution. The coming weeks will test whether the blockade threat serves primarily as a diplomatic bargaining chip or signals a genuine shift toward military confrontation with Iran.