On September 17, 2026, 46 of the 47 members of the Senate Democratic caucus wrote to Defense Secretary Pete Hegseth demanding a full accounting of what the Iran war has cost, by September 30. The letter was led by Sen. Elissa Slotkin of Michigan. Sen. John Fetterman of Pennsylvania was the only member who did not sign.
The letter's force comes from the comparison it draws with the last war of this scale. “Donald Rumsfeld, as Secretary of Defense during the Iraq War, briefed Congress more than 20 times in the first six months of that war,” it says. “In stark contrast, you have briefed Congress just seven times in that same period and, in those appearances, refused to answer basic questions about the objectives and cost of this war. Your Department has held only eight Pentagon press briefings or interviews since the start of the Iran War, compared to more than 70 in the first month of the Iraq War alone.” NBC News reported that the last Pentagon press briefing was in May.
It makes a similar comparison on the paperwork. “During the wars in Iraq and Afghanistan, Congress regularly received public supplemental requests that were more than a hundred pages long, with detailed explanations for how funding would be used, down to the number of barrels of fuel,” the senators wrote. “In contrast, your public $67 billion Iran war supplemental request was a thin, seven-page document with only vague descriptions, such as '$1.2 billion for Administration priorities.'”
The letter sets out the war's toll: “More than six months into a war that the President said would last six weeks, 18 American servicemembers have been killed, 824 have been wounded, and more than 50,000 troops are currently deployed in the Middle East.” It says Americans “have already paid an extra $100 billion out of their pockets for higher gas and diesel prices alone and at least another $60 billion in higher costs for things like groceries, mortgages, and plane tickets as a result of the war. Now you are asking that they pay again to fund a war of choice that Congress never authorized and the President launched with no strategic plan.”
It makes three requests: a breakdown of operational costs to date “inclusive of all direct and indirect costs,” explicitly covering “damage to military installations, aircraft, and equipment; cost to refurbish deployed ships and aircraft; and expected benefits for veterans”; a breakdown of the $67 billion supplemental; and an accounting of the $34 billion remaining from the One Big Beautiful Bill Act.
The senators closed by quoting Hegseth to himself. In 2012 he criticized the Pentagon's ability to “shift literally hundreds of millions of dollars from program to program with little accountability,” adding that “[r]eforming the culture at the Pentagon to bring greater spending accountability will be difficult, but it's long overdue.” Last year he said “the American taxpayers deserve” to know where their money goes, “how it's spent and make sure it's spent wisely.” The letter's response: “We agree.”
Fetterman explained his refusal on the record: “My record has been consistent. I've always been at odds with my fellow Democrats over how we hold Iran accountable. I'll continue to remain an unapologetic supporter of efforts to confront the Iranian regime and its proxies.”
As NBC News summarized the gap, the Pentagon “has not detailed the total cost of the war, including how much it would cost to repair damage to U.S. military bases, replace destroyed air and naval assets, and refurbish ships and aircraft ground down by seven months of war.”
Update (September 19, 2026): the Pentagon put a number on the war, but not the one the senators asked for. A Central Command assessment sent to the defense oversight committees estimates the cost at $43.6 billion, current as of September 3. Four outlets independently reviewed the document, and the published breakdowns reconcile. CNN's higher figure of $45.1 billion is the same estimate plus $1.5 billion in fuel, not a competing number.
Two things about it matter for this entry. It predates the senators' letter by two weeks, so it is a routine assessment rather than a response to them. And it excludes damage to military installations, which is the first item on the senators' list of requests. The accounting they asked for, covering damage to installations, aircraft and equipment, the cost of refurbishing ships and aircraft, and expected veterans' benefits, has not been provided.
Separately, Moody's Analytics estimates that U.S. energy consumers have paid about $121 billion more since the war began. That is an estimate of added consumer cost, not a measurement of federal spending.