As the price of the U.S.-Iran conflict mounts, Republicans who control Congress are preparing for a contentious battle over how to pay for it. Lawmakers returning from recess will confront competing pressures: some GOP members want limits or greater oversight, Democrats want to block or condition funding, and the White House has not provided a detailed public accounting of costs.
Independent estimates put the bill so far near $30 billion. The White House’s broader defense request for fiscal 2027 is roughly $1.5 trillion, but it is unclear how much of that is directly tied to operations in Iran. Analysts and officials have discussed a separate supplemental appropriation in the $80 billion to $100 billion range to cover combat costs and equipment losses.
The legal clock set by the 1973 War Powers Resolution adds urgency. Under the law, military operations must end after 60 days unless Congress authorizes them; the president may extend by 30 days. That deadline has sharpened objections from a growing number of Republicans who say Congress must be consulted if hostilities continue or if ground troops are committed.
Sen. Susan Collins (R-Maine) criticized inflammatory rhetoric and said she would not back sending ground forces or extending hostilities past 60 days without a ‘‘dramatic change.’’ Sen. John Curtis (R-Utah) has likewise said he will not support continued military action beyond the 60-day window absent congressional authorization. Senators Thom Tillis, Todd Young and Lisa Murkowski, and Reps. Don Bacon and Mike Lawler, among others, have warned that extended operations or additional authorities should require congressional engagement and clearer briefings for lawmakers.
Cost drivers cited by analysts include weapons expended, damage to aircraft and infrastructure, and costly rescue operations. The Washington Post reported the U.S. fired more than 850 Tomahawk cruise missiles in the campaign, each costing several million dollars. CSIS senior advisor Mark Cancian has pointed to losses of aircraft and other expensive systems, and said those items help explain the roughly $29 billion estimate to date.
With narrow GOP majorities in both chambers, leaders cannot afford many defections. Some conservatives oppose the war on principle or on fiscal grounds. Sen. Rand Paul and Rep. Thomas Massie have been vocal about restricting expanded war powers and resisting additional funding without tighter limits.
Democrats are mobilizing to block or condition any Republican-led funding push and to force votes that put GOP members on record ahead of the election year. Senate Minority Leader Chuck Schumer argued no president should take the country to war alone, and House Minority Leader Hakeem Jeffries tied criticism of the conflict to pocketbook issues at home, saying taxpayer dollars are being spent on the war instead of domestic affordability priorities.
Analysts also warn of broader economic effects. Roger Pielke Jr., a senior fellow at the American Enterprise Institute, estimated higher fuel costs through early April could translate into roughly $12.1 billion in extra spending by consumers — about $92 per household — with additional impacts on airfares and fertilizer prices that ripple through food and travel costs.
Democrats themselves are not monolithic: some lawmakers, including Sen. John Fetterman and Reps. Henry Cuellar, Juan Vargas and Jared Golden, opposed a recent Democratic effort to limit the president’s Iran war powers. Observers say positions may shift as the conflict continues and as more information becomes available.
Cancian and other analysts expect Democrats to escalate arguments about transparency, authorization and affordability. But the outcome may hinge on whether Republican leaders can keep their caucus unified. If they do, Democrats’ ability to block funding could be limited despite vocal opposition.