WASHINGTON – Republican senators emerged from a classified briefing with Defense Secretary Pete Hegseth on Thursday with questions about the Iran war that their own leadership had discouraged them from asking publicly: how does it end, and on whose terms. The Hill reported that GOP members pressed Hegseth on the conflict’s endgame following the twelfth consecutive night of US airstrikes against Iranian military targets.
The questions represent an uncomfortable shift within a party that spent the spring rallying around the administration’s decision to escalate against Iran. Senate Republicans voted in March to extend emergency war powers authorization and in May to approve supplemental military spending that kept the air campaign funded through the summer. Thursday’s hearing, conducted behind closed doors before the public airing of concerns reported by The Hill, suggests that the unanimity of the early months has given way to something more conditional.
Hegseth told reporters leaving the hearing that the strikes were “further degrading Iran’s military capabilities,” the formulation Fox News has reported he has used consistently across the twelve-night campaign. The Pentagon has described targets including air defense installations, drone production facilities, and ballistic missile storage sites. What Hegseth did not provide, according to accounts from senators’ offices, is a description of the conditions that would conclude the campaign. The standard language of “when Iran changes its behavior” does not constitute an exit strategy in the way that this session of Congress has come to understand the term.
The concern carries weight from the Senate Foreign Relations Committee, whose Republican members have been among the strongest public supporters of the Iran campaign. When committee members ask a cabinet secretary in private what “success” looks like, the question is not procedural. It reflects either a briefing gap or a genuine absence of clarity at the policy level, and the distinction matters less to the senators asking it than the absence of a satisfying answer.
The costs of the war arrived on Thursday in multiple forms. Reuters described this week as “the week the costs of the Iran war came home,” a framing that captures the convergence of Brent crude above $100 a barrel, a Dow Jones Industrial Average drop of more than 500 points triggered by Houthi strikes on Saudi tankers in the Red Sea, and a ten-year Treasury yield at its highest level since January 2025. Shipping insurance premiums for Hormuz transits have reached $21 million per voyage, and the broader economic damage from the conflict extends well beyond what initial defense budget projections suggested.
The Senate’s discomfort has a historical shape. The Vietnam-era War Powers Resolution was the product of a Congress that felt it had been drawn into an open-ended conflict without a clear definition of objectives. The resolution has been invoked, amended, and largely defied by every administration since its passage in 1973, but its logic resonates when members of the president’s own party begin asking the same questions that opponents of past wars asked. The Iran war authorization Trump received in March was broad, deliberately so. The senators asking Thursday about the endgame are beginning to wonder how broadly it will be used.
The labor market is holding, with weekly jobless claims at their lowest level since 1969, which removes one of the political pressures that would normally accelerate congressional reconsideration of a costly military campaign. But oil persistently above $100 is regressive: it hits lower-income households, who spend a higher proportion of income on gasoline and food transportation costs, disproportionately. That distribution of pain, concentrated in households that constitute a significant share of the Republican electoral coalition, creates pressure from below that the party’s leadership is beginning to register.
Secretary of State Marco Rubio added a parallel dimension. Addressing reporters Thursday on the Ukraine file, Rubio described the administration as “ready to help end the senseless war” there but acknowledged no quick deal was imminent, AP News reported. The dual-front framing, Iran and Ukraine both in active conflict status with US involvement in both, describes a strategic environment that “further degrading Iran’s capabilities” does not fully account for.
The senators who raised concerns Thursday did not characterize their questions as opposition to the war. Several said, through aides, that they remain supportive of the administration’s objectives. The distinction they are drawing is between support for the strategic goal and confidence in the tactical trajectory. At twelve nights of airstrikes, a reasonable question is whether Iran is degrading in the direction the Pentagon describes or adapting in ways the Pentagon has not yet fully mapped. Al Jazeera reported Thursday that Russia has provided Iran with the Kometa-M anti-jamming navigation system and satellite intelligence that enhanced Iranian drone accuracy against CIA-linked sites in the Gulf. If the reporting holds, the campaign’s technical effectiveness is more contested than the Pentagon’s language suggests.
The broader Middle East continues to fracture along economic lines that the air campaign did not create but has deepened. Israeli banks are severing Palestinian correspondent ties. Palestinian financial capacity is eroding. Houthi forces struck Saudi vessels in the Red Sea on Thursday. None of these developments are the Iran war directly, but all of them are connected to the environment the war has created. Republican senators who understood themselves to be voting for a targeted campaign are watching a region in which the boundaries of that campaign are becoming increasingly difficult to define.
What the senators left Thursday’s hearing without is an answer to the question they went in asking. Hegseth’s “further degrading” formulation describes a process, not an endpoint. Twelve nights of airstrikes have not produced a public Iranian offer to negotiate, a pause in Houthi attacks on Red Sea shipping, or a statement of conditions from either side that would constitute the basis for talks. The endgame, as of Thursday, remained the question the briefing could not answer.
