Republicans are beginning to turn a senior Trump official.
Concerns are growing among some Republican senators over the leadership of Defense Secretary Pete Hegseth as the conflict with Iran continues without a clear resolution.
While President Donald Trump has continued to defend his administration’s national security strategy, several GOP lawmakers are raising questions about the Pentagon’s handling of the war, citing rising costs, higher energy prices, and what they describe as strategic mistakes that have prolonged the conflict.
The criticism marks one of the most significant public challenges Hegseth has faced since taking over the Department of Defense, with some Republicans calling for greater accountability as Congress prepares to debate billions of dollars in additional military funding.
Republican Senators Question Pete Hegseth’s Leadership
Sen. Thom Tillis (R-N.C.) emerged as one of Hegseth’s strongest Republican critics, saying he no longer has confidence in the defense secretary’s leadership.
“I don’t have any confidence in him anymore,” Tillis said, arguing that Hegseth has pushed experienced military leaders out of the Pentagon while attempting to centralize too much authority.
The North Carolina senator also questioned Hegseth’s management style, saying the defense secretary lacks experience leading a large organization and has become overly involved in decisions that should be handled by senior military officials.
Tillis suggested that other Republicans may soon join him in voicing concerns.
“I think there are other people that are probably one decision away from speaking out,” he said.
His comments are especially notable because his vote could prove important as Senate Republicans work to advance major defense funding legislation before lawmakers leave Washington for the August recess.
Pentagon Strategy Faces New Scrutiny
Several Republican senators believe the administration underestimated how long Iran could disrupt global shipping through the Strait of Hormuz, one of the world’s most important energy corridors.
The continued disruption has contributed to higher oil prices and increased fuel costs while creating uncertainty in global energy markets.
Lawmakers have also questioned whether military planners fully anticipated Iran’s willingness to target neighboring countries, including Jordan, Kuwait, and Saudi Arabia, or the expanded role of Iranian-backed Houthi militants attacking commercial shipping routes in the Red Sea.
One Republican senator, speaking anonymously to discuss private conversations, said there is growing concern both on Capitol Hill and inside the Pentagon.
“I think there’s a sense it’s taken longer than what we thought,” the senator said, adding that there may have been “some miscalculations.”
Senior Military Departures Raise Questions
The recent departure of several high-ranking military leaders has also fueled concern among Republicans.
Some lawmakers worry that replacing experienced commanders during an active military conflict could affect long-term planning and battlefield decision-making.
Sen. Susan Collins (R-Maine), chair of the Senate Appropriations Committee, publicly questioned the recent departures during a hearing with Hegseth.
“I find this deeply troubling,” Collins said.
After the hearing, Collins said she still wanted additional information from the administration regarding its overall military strategy and long-term objectives in the region.
“I thought the hearing was somewhat helpful, but questions remain,” she said.
Defense Hawks Want Stronger Military Action
Not every Republican believes the administration should change course.
Several national security hawks argue the United States should increase military pressure on Iran instead of scaling back operations.
Senate Armed Services Committee Chairman Roger Wicker (R-Miss.) has urged President Trump to “finish the job” by increasing military pressure.
Sen. John Cornyn (R-Texas) also expressed confidence that the United States has the military capability necessary to reopen the Strait of Hormuz without making significant concessions.
“If anybody can do it, the United States can,” Cornyn said.
Cornyn argued that decisive military action would ultimately reduce the risk of a prolonged conflict.
Rising War Costs Become a Growing Concern
The financial cost of the Iran conflict has become another major issue for lawmakers.
Defense officials recently estimated the cost of military operations at roughly $37.5 billion, while some independent analysts have projected substantially higher figures.
Those differences have prompted calls from Republicans for greater transparency from the Pentagon.
Sen. Joni Ernst (R-Iowa), a member of the Senate Armed Services Committee, said many lawmakers remain concerned about defense spending and want clearer answers regarding the total cost of military operations.
“I still don’t know that there’s a lot of clarity on that,” Ernst said.
Public Support Shows Signs of Softening
As the conflict approaches its fifth month, some Republicans acknowledge that public patience may be wearing thin.
Sen. Shelley Moore Capito (R-W.Va.) said many Americans are growing increasingly concerned as the fighting continues with no obvious end in sight.
At the same time, Congress is preparing to debate another major defense funding package that would provide billions of additional dollars for military operations.
Passing that legislation could prove difficult if more Republican lawmakers demand additional answers from Pentagon leadership before approving new spending.
Pressure Builds Ahead of Key Funding Vote
Congress will soon decide whether to approve another round of military funding requested by the Trump administration.
That debate is expected to place renewed attention on Defense Secretary Pete Hegseth and the Pentagon’s handling of the conflict.
While President Trump continues to enjoy strong support from much of the Republican conference, criticism from several GOP senators suggests questions about the Pentagon’s leadership are becoming more difficult to ignore.
Whether those concerns remain limited to a handful of lawmakers—or grow into broader opposition—could shape both future military policy and the upcoming debate over national defense spending in the weeks ahead.
