Defense Secretary Pete Hegseth is facing growing backlash after threatening new legal action against Democratic Senator Mark Kelly in a dramatic escalation of one of the Trump administration’s most explosive political feuds.

And critics say the Pentagon chief appears increasingly desperate.

The latest clash erupted after Kelly appeared on CBS News’ “Face the Nation” and sharply criticized President Donald Trump’s ongoing war with Iran.

Kelly warned that the administration has burned through massive amounts of U.S. military stockpiles without clearly explaining the long-term strategy behind the conflict.

“Because this president got our country into this without a strategic goal, without a plan, without a timeline,” Kelly said, “we’ve expended a lot of munitions. And that means the American people are less safe.”

The comments immediately triggered fury from Hegseth.

Reacting on X, the defense secretary accused Kelly of improperly discussing classified Pentagon information and suggested the senator may have violated his oath.

“‘Captain’ Mark Kelly strikes again,” Hegseth posted mockingly.

He then announced the Pentagon’s legal counsel would review whether Kelly committed misconduct by discussing military stockpile concerns publicly.

But Kelly fired back almost instantly.

The Arizona senator — a decorated Navy combat veteran and former NASA astronaut — posted video footage showing that Hegseth himself had publicly discussed the same issue during a Senate Armed Services Committee hearing just days earlier.

“We had this conversation in a public hearing a week ago,” Kelly responded. “That’s not classified, it’s a quote from you.”

The exchange immediately reignited scrutiny surrounding Hegseth’s long-running campaign against Kelly.

For months, the Pentagon chief has aggressively targeted the senator over a November video in which Kelly and several Democrats reminded military personnel that they are legally allowed to refuse unlawful orders.

Trump allies erupted over the video at the time, with some accusing the lawmakers of undermining military discipline.

Trump himself reportedly accused the Democrats involved of sedition, while Hegseth later attempted to pursue disciplinary actions against Kelly, including efforts to reduce his retirement benefits.

But those efforts suffered major legal setbacks.

Earlier this year, a federal judge blocked Hegseth’s attempts to censure or punish Kelly, while a grand jury reportedly declined to indict the lawmakers involved in the original video.

Now critics say Hegseth’s latest legal threat appears to be another failed attempt to intimidate one of the administration’s most vocal military critics.

Military affairs reporters also quickly noted that Kelly never revealed any specific classified figures or sensitive operational details during his television interview.

“That’s generally where classification comes into play,” one journalist noted online. “No sign of that here.”

The feud has become symbolic of broader tensions surrounding Trump’s Iran conflict, military transparency, and growing concerns over political retaliation inside the administration.

Supporters of Hegseth argue Pentagon officials must aggressively protect classified military information during wartime.

Critics, however, accuse the administration of weaponizing accusations of misconduct against political opponents.

And as the Iran conflict drags deeper into its third month, the bitter battle between Kelly and Hegseth appears far from over.