GOP senators are breaking ranks to challenge Defense Secretary Pete Hegseth's management of the U.S. war with Iran, a conflict President Trump predicted would last weeks but now grinds on with no end in sight.
Sen. Thom Tillis of North Carolina delivered the sharpest public rebuke yet from a Republican, telling The Hill flatly that Hegseth has lost his confidence. Tillis pointed to forced retirements of senior military leaders, a lack of strategic clarity, and what he called Hegseth's habit of trying to run every corner of the Defense Department himself.
The criticism is no longer confined to one senator. Behind closed doors, multiple Republican members have voiced similar frustrations, and at least two unnamed GOP senators confirmed to The Hill that doubts about Hegseth's leadership have spread inside the Pentagon itself. One senator close to defense policymakers said the loss of confidence is not just on Capitol Hill, it starts inside the building Hegseth runs.
Tillis, who announced last year he will not seek reelection, has grown more willing to challenge the administration publicly. His language about Hegseth left little room for interpretation.
"I don't have any confidence in him anymore. I think he's all over the place, he's accelerating the retirement or forcing out some of the most distinguished leaders in the DOD that we have."
He went further in a second exchange, calling Hegseth's management style a liability.
"I think he's got a massive insecurity complex, he has a lack of experience in large organizations, he micromanages too much. He's lost my confidence."
Tillis warned he is not alone, saying other senators are "probably one decision or another" away from speaking out. He compared the internal dynamics at the Pentagon to a power struggle, saying colleagues on both sides of the aisle are aware of friction between Hegseth and service secretaries.
That friction has drawn scrutiny before. Pentagon insiders have previously described a rigid leadership culture under Hegseth that has weighed on morale across the department.
"When you're a leader, you better d*** sure have people smarter than you in the room. You're supposed to be air traffic control for all these brilliant people and he's undermining the DOD's success by undermining these brilliant people who spent their career in uniform."
Tillis's vote matters beyond the rhetorical. With a $95 billion reconciliation package, including $73 billion for the Pentagon and U.S. intelligence agencies, needing to clear the Senate before the August recess, every Republican vote counts. Sen. Mitch McConnell of Kentucky has not voted since June 11 because of a health issue, thinning the GOP margin further.
The political backdrop sharpening these complaints is a conflict that has far outrun the administration's early projections. In early March, President Trump said the war with Iran would last four or five weeks. Nearly five months later, the Strait of Hormuz remains closed, oil and gas prices have climbed steeply since February, and the fighting has expanded into new theaters.
Iranian-backed Houthi militants targeted Saudi oil shipments in the Red Sea in recent days, widening the conflict to the Bab el-Mandeb Strait, a chokepoint Tillis said the administration failed to anticipate Iran would contest. Iran has also struck neighboring allies including Jordan, Kuwait, and Saudi Arabia, an escalation a second anonymous Republican senator described as a sign of strategic miscalculation.
"I think there's a sense it's taken longer than what we thought and that maybe our strategy didn't factor in the Strait of Hormuz or [Iran's] ability to be willing to hit their neighbors. I think there was some miscalculations maybe."
That senator requested anonymity to discuss private conversations. But the willingness of named senators to go on the record shows the discontent has moved past the whisper stage.
Senate Appropriations Committee Chair Susan Collins of Maine used a recent hearing to challenge Hegseth directly on the departure of senior military officials. Hegseth appeared before her panel to discuss the administration's request for emergency defense funding.
Collins called the forced retirements "deeply troubling."
"These are men and women who volunteered to serve our country and swore an oath to support and defend our Constitution."
One departure drawing particular concern is Gen. Chris Donahue, the top U.S. Army commander in Europe, who was forced into retirement earlier this month. Republican lawmakers have split openly over Hegseth's decision to remove Donahue, with some questioning whether stripping experienced leadership in the middle of a shooting war serves any coherent strategic purpose.
After the hearing, Collins said the session was "somewhat helpful" but that she still wants "more information" from the administration on "the strategy and endgame for the war." That is a polite way of saying the administration has not yet explained how this ends.
The cost of the conflict has become a flashpoint of its own. Hegseth told senators last week the war has cost $37.5 billion. Independent analysts at Moody Analytics project the real figure is at least $132 billion, more than three times Hegseth's number.
Sen. Joni Ernst of Iowa, a member of the Senate Armed Services Committee, said the gap between those figures is exactly what worries her colleagues.
"Collectively those of us in Congress are worried about the costs associated with the Department of War and the transparency. I think... why they've asked him to come to the Hill and present the numbers, and I still don't know that there's a lot of clarity on that."
Ernst's use of "Department of War", whether intentional or informal, underscored the blunt mood among Republican members. The concern is not abstract. The House approved a budgetary framework last week that includes $73 billion in military funding, and Trump has demanded it pass through the reconciliation process to bypass a Democratic filibuster. Senators who lack confidence in the Pentagon's accounting are being asked to vote for a massive new funding tranche on trust.
Hegseth has faced scrutiny over transparency before. The Washington Examiner reported that GOP senators and advisers have grown privately frustrated over multiple Signal chat leaks, including instances where Hegseth shared sensitive military attack plans, one of which accidentally reached a journalist. His recently departed communications chief publicly criticized his management in an op-ed, and only one congressional Republican, Rep. Don Bacon of Nebraska, has openly called for Hegseth's removal.
Sen. Shelley Moore Capito of West Virginia put the political risk plainly in a recent interview with NewsNation: "I do think that the American public's growing weary."
Not every Republican critic wants Hegseth replaced. Some want the war prosecuted harder. Sen. John Cornyn of Texas argued the United States has the military strength to force Iran to reopen the Strait of Hormuz without major concessions, and that the real danger is half-measures.
"I think we just need to demonstrate our decisive military edge and reopen the Strait of Hormuz because we can't depend on the Iranian regime. If anybody can do it, the United States can."
Cornyn framed the stakes in terms conservatives have debated for two decades: the trap of gradual escalation.
"The problem of endless wars, in my view, is gradual escalation. Until then, you are stuck and there is no way out other than just sort of capitulation. So I think a decisive outcome by opening the Strait of Hormuz should be the goal."
Senate Armed Services Committee Chair Roger Wicker of Mississippi has also urged Trump to "finish the job" by intensifying strikes. That position, hit harder, win faster, coexists uneasily with the management critique from senators like Tillis and Collins. One camp questions whether Hegseth can lead the Pentagon through a complex, expanding war. The other questions whether the civilian leadership is letting the military fight with full force.
Hegseth has clashed with Senate Democrats in recent hearings over defense funding, but the emerging challenge comes from his own side of the aisle.
Meanwhile, the State Department announced a $4 billion arms package to Taiwan, including missiles, rocket systems, and drones, during a recent Trump address, a reminder that the Pentagon's obligations extend well beyond the Persian Gulf even as the Iran war consumes attention and resources.
The Hill reached out to the Department of Defense for a response to the senators' criticisms. No DOD comment appeared in the report. That silence, in the middle of a war that has outrun its projected timeline by months and its projected budget by tens of billions of dollars, speaks for itself.
Tillis's warning that other Republican senators are close to going public with their own doubts suggests the pressure on Hegseth will grow, not fade. The questions are straightforward: Who is running the war? What is the strategy? When does it end? And why should Congress write another $73 billion check when the last set of numbers did not add up?
A Defense Secretary who launched a joint task force to hunt down Pentagon leakers may soon find that the loudest critics are not anonymous sources, they are Republican senators with microphones and votes.
When your own party starts asking for receipts in the middle of a war, the problem is not messaging. It is performance.
