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"He served in the Army.
He felt like he wasn't treated well by the Army, that's a grudge he's carried that he's described publicly," Kaine said.
"And so, when you see Army officers forced out, you got to wonder, is this a personal thing, or is it really what's best for the nation?"
Critics outside of Congress also voiced strong concerns over the sudden restructuring of the military hierarchy under Hegseth's leadership.
Retired Admiral Bill McRaven, a defense critic, wrote that the moves "raise a real risk that senior officers will be overly cautious about providing their best advice and, therefore, that the chance for military miscalculation will grow dramatically."
Republican Senator Thom Tillis of North Carolina joined the criticism, blasting the defense chief's management style on the social media platform X.
"His paranoid micromanagement of senior military leaders and promotion lists is pure insecurity dressed up as reform," Tillis wrote.
"He is more interested in purging people he perceives as insufficiently loyal than empowering proven patriots who can actually lead."
Tillis characterized the forced exit of the highly respected commander as an unnecessary strategic blunder for the armed forces.
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"Yet another unforced error from a Secretary leading the Pentagon with bro-culture bravado rather than restraint, humility and careful stewardship of the finest fighting force in the world," Tillis wrote on X.
