Defense Secretary Pete Hegseth and Gen. Dan Caine, chair of the Joint Chiefs of Staff, testified before the Senate Appropriations Committee on July 21, 2026, to defend the Trump administration's $87.6 billion emergency supplemental funding request for the US-Israel war on Iran. The Pentagon told lawmakers it was running low on cash to continue the war effort.

The hearing, formally titled "A Review of the President's Supplemental Funding Request of June 24, 2026," was the first sustained public questioning of Hegseth and Caine since a brief ceasefire in the Iran war collapsed. Committee Chair Susan Collins of Maine presided, with Democratic Vice-Chair Patty Murray joining in questioning the two witnesses.

Of the $87.6 billion request, $67.1 billion is earmarked specifically for the war effort, and $21 billion would go toward recouping munitions expended in the Iran conflict. The package also includes funding to strengthen the US defense industrial base. OMB Director Russell Vought had formally transmitted the request to House Speaker Mike Johnson on June 24, though the Pentagon had signaled roughly two days earlier that it needed approximately $80 billion, mostly to cover Iran war costs.

The July 21 testimony comes against mounting American casualties. At least two US soldiers were killed in an Iranian attack on July 17, 2026. Another US soldier died in Iraq while destroying an Iranian drone. The total American death toll in the Iran war since February 2026 now stands at 17. Nearly 100 US troops have been wounded, though most injuries were described as minor.

Congressional scrutiny of the war's financial trajectory has intensified. OMB Director Vought previously told Congress the war's running cost was about $30 billion, a figure experts largely believe is a severe undercount. On the House side, Rep. Betty McCollum, the top Democrat on the House defense appropriations panel, said the Pentagon missed a deadline to detail war costs and has not disclosed how many precision munitions remain after burning through thousands in Iran.

The $87.6 billion request is substantially smaller than the $200 billion in additional Iran war funding the US military initially requested, a figure disclosed by a senior administration official in March 2026 and reported by Reuters and the Associated Press. At that time, Hegseth told Congress lawmakers had already boosted Pentagon funding. The scaled-back supplemental now before Congress has still faced reluctance from both Democrats and Republicans.

The political dynamics around the war extend beyond the supplemental. Senate Democrats blocked a $1 trillion defense bill on July 14, 2026 in protest. That bill is a must-pass package that would set military policy for the year and authorize a pay raise for troops. Senators Collins and Lisa Murkowski, both Republicans, have crossed party lines to back war-powers resolutions aimed at reining in the president's authority over the Iran conflict. Collins has previously voiced frustration that the administration's strategy for the war seems to shift almost daily.

The broader context here is one of compounding pressure on the administration from multiple directions: a war whose costs keep climbing, a supplemental request that has already been trimmed from its original scale and still meets bipartisan resistance, a must-pass defense authorization held up by Democratic opposition, and members of the president's own party signing onto war-powers resolutions. The hearing gave senators their first extended opportunity to press the Pentagon's civilian and military leadership on these intersecting fronts simultaneously.

The munitions question raised by McCollum is particularly pointed given the $21 billion earmarked for recouping expended stockpiles. The Pentagon's refusal or failure to disclose remaining precision-munition inventories, combined with the missed cost-reporting deadline, gives ammunition to lawmakers who argue the administration is conducting the war with insufficient transparency. Whether the supplemental moves through Congress, and in what form, will likely hinge on whether Hegseth and Caine's testimony has reassured enough senators that the Pentagon can account for both the money already spent and the money it is now requesting.