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The Pentagon told U.S. lawmakers that the cost of war against Iran has reached $37.5 billion so far and that military operations could face significant disruptions without additional emergency funding of billions of dollars.

U.S. Secretary of War Pete Hegseth and Chairman of the Joint Chiefs of Staff Gen. Dan Caine appeared before the Senate Appropriations Committee on July 21, 2026, to request $67.1 billion in supplemental funding, arguing that the money is urgently needed to continue military operations, replenish depleted weapons stockpiles and maintain the readiness of U.S. forces.

The hearing highlighted growing political divisions over the five-month conflict, with Democratic lawmakers questioning both the rising financial cost of the war and the administration’s broader military spending plans.

The funding debate also comes as President Donald Trump seeks a record $1.5 trillion Pentagon budget for fiscal year 2027 while the U.S. military continues daily combat operations against Iran.

War Costs Continue to Rise

Hegseth said the conflict, which began on February 28, has now cost the Pentagon approximately $37.5 billion, an increase of nearly $8.5 billion since May, when he estimated total spending at around $29 billion.

The defense secretary said the figure includes current operational costs as well as anticipated expenses through September 30, emphasizing that additional funding is essential to prevent disruptions to ongoing military operations.

.@SECWAR “Iran is at the WEAKEST POINT MILITARILY it has ever been in…

I acknowledge they still have capabilities, no doubt, but the amount of damage that we have done to them over the course of these series of operations has put them in the WORST PLACE THEY’VE EVER BEEN.” pic.twitter.com/mLr1AeHuzb

— DOW Rapid Response (@DOWResponse) July 21, 2026

“The military requires a generational investment to deliver on peace through strength,” U.S. Secretary of War Hegseth told senators.

Hegseth argued that the Pentagon’s remaining funds from previous congressional appropriations were already allocated to rebuilding military capabilities after years of underinvestment.

“The new request is an urgent, necessary injection of resources to address immediate needs,” Hegseth said, describing the supplemental package as “a new request based on new realities of a world we face.”

He also criticized the previous Biden administration, saying the Pentagon inherited “stale thinking and bureaucracy” that required significant investment to reverse.

How the Funding Would be Spent

Although the Pentagon is requesting $67.1 billion in emergency funding, officials said only about half of the package, roughly $32.7 billion, would directly support ongoing military operations against Iran.

The remaining funds would finance broader national security priorities, including replenishing weapons inventories and strengthening military capabilities.

The Pentagon proposal includes:

• $21 billion for munitions.
• $17.3 billion for military operations.
• $12.1 billion for classified defense programs.
• $5.1 billion for cybersecurity.
• $2.4 billion for drones and unmanned systems.
• $1.7 billion for military readiness.
• $1.5 billion for fuel.
• $2 billion for administration priorities and National Guard support, including deployments along the southern U.S. border and in Washington, D.C.

Hegseth warned that without congressional approval, the Pentagon could be forced to reduce military training, delay maintenance programs and struggle to replenish precision-guided weapons being consumed during the conflict.

Gen. Caine echoed those concerns, saying the United States still has a strategic opportunity to maintain military pressure. “I sit before you asking for this funding while the window of opportunity, while time, is still on our side,” Caine told lawmakers.

He warned that America’s competitors were increasingly coordinating military technologies and intelligence sharing, accelerating the pace of modern warfare.

“Our adversaries are aligning in their interests, creating simultaneous challenges across multiple domains,” Caine said.

Lawmakers Question Growing Military Spending

The funding request faced strong resistance from Democratic senators, who argued that the administration was attempting to use emergency wartime legislation to finance broader Pentagon priorities unrelated to the Iran conflict.

Sen. Patty Murray, the committee’s top Democrat, said lawmakers would not “rubber stamp” the request, noting that the Department of Defense already received more than $1 trillion in funding last year and is seeking roughly $1.3 trillion in regular appropriations in addition to the supplemental package.

“The president’s request is not even primarily a request to cover the costs of the Iran war,” Murray said.

“This request is chock full of asks to fund unrelated DoD priorities, which should be considered through our annual appropriations process, not in an emergency supplemental.” Sen. Kirsten Gillibrand questioned the administration’s priorities as Americans continue to face rising living costs.

“You’re asking for unlimited money for bombs, but insufficient money for the American people for their healthcare, their food, their housing,” she said.

The hearing also became increasingly tense as anti-war protesters interrupted proceedings several times before being removed.

.@SECWAR “Why don’t you show some leadership and STAND UP TO YOUR FELLOW DEMOCRATS WHO WON’T FUND THE TROOPS.

WHO STAND TO PLAY PARTISAN POLITICS WHILE YOU DON’T GIVE US THE MONEY. You want to STAND UP HERE and talk about the troops…

You have Trump derangement syndrome and… pic.twitter.com/YF7ebduygu

— DOW Rapid Response (@DOWResponse) July 21, 2026

Later, Hegseth engaged in a heated exchange with Democratic Sen. Gary Peters, who accused the administration of creating another “forever war.” Hegseth rejected the criticism and defended the administration’s military strategy.

Conflict Intensifies Across the Region

The funding request comes as fighting between the United States and Iran has intensified in recent weeks following the collapse of an earlier ceasefire.

The U.S. military has now conducted more than 10 consecutive days of airstrikes against Iranian targets, while Tehran has continued retaliatory attacks against U.S. forces and regional partners.

According to Pentagon figures, 18 U.S. service members have been killed since the conflict began, including four fatalities reported over the past four days. More than 440 American troops have been injured, although military officials say the vast majority have returned to duty after receiving treatment.

The conflict has also disrupted global maritime trade. At least 14 merchant mariners have been killed in attacks linked to fighting around the Strait of Hormuz, according to international maritime authorities, while commercial shipping traffic through the strategic waterway has fallen sharply as security risks continue to rise.

President Trump has also signaled that military operations could expand further, warning that additional Iranian energy infrastructure and underground nuclear facilities remain potential targets if Tehran continues its attacks.

Ukraine and Legal Authority also Draw Scrutiny

Beyond the Iran conflict, senators questioned Pentagon leaders on U.S. policy toward Ukraine and the legal basis for continuing military operations without new congressional authorization.

Sen. John Kennedy asked Gen. Caine directly whether he wanted Ukraine to prevail in its war against Russia. “Sir, I want Ukraine to win,” Caine replied.

Asked whether Russia should be considered a U.S. friend, he responded, “No, I don’t think they’re our friends.”

Republican Sen. Lisa Murkowski also sought assurances that approving the emergency funding would not effectively authorize an indefinite expansion of the Iran conflict under the War Powers Resolution.

Hegseth maintained that the administration believes it currently possesses all necessary legal authority to continue military operations.

Congress Faces Difficult Decision

The debate now moves to Congress, where the administration faces growing bipartisan skepticism despite Republican majorities in both chambers.

Democrats argue the supplemental package extends far beyond the immediate costs of the Iran war, while some fiscal conservatives have also expressed concerns about rising federal spending and have called for offsets elsewhere in the budget.

The timing presents an additional challenge. With lawmakers preparing to leave Washington for the congressional recess and midterm elections only months away, any funding package could face delays before receiving final approval.

As military operations continue across the Middle East and operational costs steadily increase, the administration argues that additional funding is essential to sustain combat operations and preserve long-term U.S. military readiness.

Opponents, however, contend that Congress should first receive clearer answers about the conflict’s objectives, expected duration, and ultimate financial burden before approving tens of billions of dollars in new wartime spending.

.@SECWAR "Iran's been given every opportunity to negotiate, to show that they're reasonable on the Strait of Hormuz—but if they're going to shoot at commercial shipping, then we're going to hit them, as the president said 10x harder.

Every night, we're degrading them further… pic.twitter.com/7o28LoGfsY

— DOW Rapid Response (@DOWResponse) July 21, 2026