Sen. Mitch McConnell, R-Ky., was one of three Republicans to vote on Friday against Pete Hegseth, who was narrowly confirmed as defense secretary in the new Trump administration.

The other Republican “no” votes came from moderates Lisa Murkowski, R-Alaska, and Susan Collins, R-Maine, forcing Vice President JD Vance to break the 50-50 tie to confirm President Donald Trump’s choice to lead the Pentagon.

“The most consequential cabinet official in any Administration is the Secretary of Defense,” McConnell wrote, explaining his opposition to Hegseth. “In the face of the gravest threats to U.S. national security interests since World War II, this position is even more important today.”

“Major adversaries are working closer together to undermine U.S. interests around the world,” he said. “And America’s military capabilities and defense industrial capacity are increasingly insufficient to deter or prevail in major conflict with China or Russia, especially given the real risk of simultaneous challenges from other adversaries like Iran or North Korea.”

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Hegseth, a former Fox News host, had faced questions ahead of his confirmation over his infidelity, allegations of sexual assault and excessive drinking, his previous comments opposing women serving in combat roles in the military and his leadership abilities.

Married three times, Hegseth has admitted he was a “serial cheater” before he became a Christian and married his current wife, Jenny. He also originally said he opposed women in combat, before later saying that he only opposes standards for women in combat that are different from those for men. Hegseth has additionally denied the sexual assault allegations and has said he would abstain from alcohol as defense secretary. 

McConnell said “dust on boots” in reference to Hegseth’s military service “fails even to distinguish this nominee from multiple predecessors of the last decade. Nor is it a precondition for success. Secretaries with distinguished combat experience and time in the trenches have failed at the job.”

“Effective management of nearly 3 million military and civilian personnel, an annual budget of nearly $1 trillion, and alliances and partnerships around the world is a daily test with staggering consequences for the security of the American people and our global interests,” the senator said. “Mr. Hegseth has failed, as yet, to demonstrate that he will pass this test. But as he assumes office, the consequences of failure are as high as they have ever been.”

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McConnell stressed that Hegseth, in his testimony before the Armed Services Committee, “did not reckon with this reality” that the U.S. “faces coordinated aggression from adversaries bent on shattering the order underpinning American security and prosperity.”

“President Trump has rightly called on NATO allies to spend more on our collective defense. But the nominee who would have been responsible for leading that effort wouldn’t even commit to growing America’s defense investment beyond the low bar set by the Biden Administration’s budget requests,” McConnell said.

The senator also said Hegseth’s testimony lacked “substantial observations on how to defend Taiwan or the Philippines against a Chinese attack, or even whether he believes the United States should do so.” McConnell said Hegseth failed “to articulate in any detail a strategic vision for dealing with the gravest long-term threat emanating” from China.

McConnell additionally noted a lack of “substantive discussion” of “countering our adversaries’ alignment with deeper alliance relationships and more extensive defense industrial cooperation of our own.”

“This, of course, is due to change,” McConnell said. “As the 29th Secretary of Defense, Mr. Hegseth will be immediately tested by ongoing conflicts caused by Russian aggression in Europe and Iranian-backed terror in the Middle East. He will have to grapple with an unfinished FY25 appropriations process that – without his intervention – risks further harming the readiness of our forces.”

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“By all accounts, brave young men and women join the military with the understanding that it is a meritocracy,” he added. “This precious trust endures only as long as lawful civilian leadership upholds what must be a firewall between servicemembers and politics. The Biden Administration failed at this fundamental task. But the restoration of ‘warrior culture’ will not come from trading one set of culture warriors for another.”