U.S. Defense Secretary Pete Hegseth faced questioning from senators Tuesday regarding the escalating costs of the U.S. war in Iran.

The hearing highlights a growing tension between the administration's military strategy and congressional oversight of the federal budget. As the conflict continues, lawmakers are seeking a transparent funding roadmap to avoid an open-ended financial commitment.

During the testimony, Hegseth said the war has cost an estimated $37.5 billion [1] since fighting began in late February. The secretary said that even a sum of $1 trillion would be insufficient to ensure a victory in the conflict.

Senators expressed frustration with Hegseth's responses, describing them as evasive. Lawmakers pushed for a clear strategy to justify the continued expenditure of taxpayer funds in the region.

Currently, senators are considering a budget package totaling $95 billion [2], which includes military funding, and other national priorities. The debate centers on whether this allocation is sufficient or if the administration is underestimating the long-term costs of the engagement.

Defense Secretary Hegseth said that the scale of the conflict requires significant resources. However, the lack of a definitive end-date or a specific victory metric has drained the patience of several lawmakers on the committee.

The war has cost an estimated $37.5 billion since fighting began in late February.

The clash between Secretary Hegseth and the Senate signals a potential legislative bottleneck for future military appropriations. By suggesting that $1 trillion might not be enough, the Defense Department is signaling a high-cost, long-term conflict that may exceed current budgetary frameworks, potentially leading to more stringent oversight or funding caps from Congress.