Defense Secretary Pete Hegseth defended a supplemental funding request for the U.S. war against Iran during a Senate hearing on Tuesday.

The hearing highlights growing tension between the Pentagon and Congress over the financial sustainability and strategic justification of the conflict. As costs mount, lawmakers are questioning whether the current military strategy aligns with the budget being requested.

Sen. Kirsten Gillibrand (D-NY) pressed Hegseth for justification regarding the need for additional funds. During the proceedings, Hegseth said the total defense budget is $1.5 trillion [3]. This figure represents the broader fiscal framework the Department of Defense is seeking to maintain amid ongoing operations.

Specific to the conflict with Iran, Hegseth said the war has cost $48.5 billion so far [1]. To sustain these operations, the administration has submitted a supplemental funding request of $87.6 billion [2].

The financial debate occurs against a backdrop of human cost in the region. Reports indicate that two U.S. service members were killed in Jordan [4]. These casualties have intensified the scrutiny from senators regarding the risks associated with the current deployment levels.

This hearing follows a previous round of congressional questioning on May 12, where Hegseth also faced inquiries about the trajectory of the Iran war. The administration continues to seek these funds to ensure the Pentagon can meet its operational objectives, a goal that remains a point of contention for critics in the Senate.

“Hegseth estimated that the war has cost $48.5 billion so far.”

The gap between the estimated cost of the war to date and the requested supplemental funding suggests a significant escalation in projected spending. By defending both a $1.5 trillion base budget and a massive supplemental request, the Pentagon is signaling that the conflict with Iran is becoming a primary driver of U.S. defense spending, potentially shifting long-term fiscal priorities away from other global theaters.