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Trump's Ex-Defense Secretary Warns Airstrikes Won't Win Iran War

Donald Trump’s former defense secretary has warned that the US cannot rely on aerial bombardment to win its conflict with Iran. Mark Esper says Washington must instead impose comprehensive economic pressure to force Tehran to reopen the Strait of Hormuz.

July 16, 2026 Ahmet Koçak

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USS Nimitz and USS Philippine Sea in the Persian Gulf - US NAVY

Aerial bombardment alone will fail to secure a US victory in its escalating conflict with Iran, Donald Trump’s former defense secretary has warned.

Mark Esper cautioned that Washington must pivot toward comprehensive economic pressure to force Tehran into reopening the critical Strait of Hormuz.

The stark assessment follows a renewed wave of US military strikes against Iranian targets.

Trump recently declared a short-lived ceasefire over, accusing Tehran of violating a maritime agreement meant to guarantee free transit through the strait.

Shifting Tactics

Esper noted that intensifying the current bombing campaign will not alter Iran's strategic objectives.

He argued that the Islamic Republic remains determined to control the vital waterway.

“I’m not confident that, if we picked up the bombing the way we did months ago and sustained it for a period of time, that that would have a big change,” Esper said.

Speaking to national security experts in Aspen, the former Pentagon chief outlined a binary choice for the current administration.

“One option is you resort to full military onslaught. The other one is you strangle them economically,” Esper stated.

He emphasized the need for time, patience, and international cooperation to make financial penalties effective.

Global Economic Fallout

The standoff has already severely disrupted global energy markets.

The Strait of Hormuz typically handles roughly 20 percent of the world's oil traffic, but transit levels have plummeted since the conflict erupted.

Brent crude prices have surged by 16 percent since early July, reaching approximately $85 per barrel.

Analysts caution that prolonged closures could push prices well beyond $100, threatening a fresh burst of inflation.

Domestic energy stockpiles are also showing signs of severe strain.

Recent government data indicates that US crude inventories have dropped to their lowest levels since 1984.

Military Costs and Strategic Priorities

Beyond the economic toll, the ongoing campaign is heavily taxing American defense resources.

The Pentagon has already expended tens of billions of dollars and significantly depleted its weapons stockpiles.

Esper raised concerns that this expenditure jeopardizes broader US strategic positioning.

“What is the cost for us in terms of readiness, munitions, stockpiles,” Esper questioned. “Because my big concern globally is China.”

Esper stated that a successful Iran strategy must achieve two metrics: fully restoring free maritime traffic in the strait, and securing a nuclear agreement stronger than the pact brokered under Barack Obama.

Other former officials share the preference for financial attrition over military engagement.

Condoleezza Rice, a former secretary of state, endorsed the strategy of maximizing economic pain rather than pursuing an immediate nuclear agreement.

Trump's Ex-Defense Secretary Warns Airstrikes Won't Win Iran War