In an appearance on “Jimmy Kimmel Live,” Sen. Mark Kelly, D-Ariz. blasted Defense Secretary Pete Hegseth, calling him unqualified and saying he just wants to please President Donald Trump.

The comments came after Hegseth asked the Navy secretary to review Kelly’s comments in a video to troops for “potentially unlawful conduct,” according to a memo posted on social media by the Pentagon.

Kelly told Kimmel that the president and his administration’s reaction sows fear, calling it an example of “how democracies die.”

“It is right out of the playbook, you know, the playbook of authoritarianism. That’s what they do. They try to suppress speech,” Kelly said. “Every one of us has First Amendment speech rights, and I think the president is infringing on those and he is sending, he is sending a pretty strong message. You do not want to cross him, and your loyalty should be to him. It should not. It should always be to the Constitution.”

Kelly also addressed the Defense Department’s review of his comments in the video, saying that Hegseth is “totally unqualified” for the job and that “he just wants to please the president.”

“He can go after me under the Uniform Code of Military Justice, which is law in the military, which is kind of wild, because we recited something in the Uniform Code of Military Justice, and he’s going to prosecute me under the Uniform Code of Military Justice,” Kelly said. “It is so ridiculous, it’s almost like you can’t make this s*** up.”

Kelly also told Kimmel how he found out that Trump first reacted to the video with the post, calling it “SEDITIOUS BEHAVIOR, punishable by death!” Kelly detailed that he was with Sen. Elissa Slotkin, D-Mich., when a staffer interrupted their briefing and slid her a piece of paper.

“So somebody comes in in the middle of our brief, slips her piece of paper and I take a look at the piece of paper, and it says ‘the president is calling for your execution’– to her, to Elissa, so she, she looks at me, she gets up, she walks out,” Kelly said. “About five minutes later, she comes back in, looks at me and says, ‘Well, he’s calling for your execution too.’ So I wasn’t off the hook.”

Kelly also pointed to Trump’s attacks on Kimmel, as well as his administration’s alleged targeting of law firms, universities and media companies, saying that he is “suing people repeatedly to suppress their opinion, to make sure that everybody knows that your loyalty should be to Him.

All military officers who have retired after 20 years of service are able to be recalled to active duty, and if they are determined to have engaged in misconduct, they are subject to military prosecution — potentially a court-martial.

Kelly served for 25 years in the Navy and at NASA, retiring in 2011.

The code referenced by the Defense Department could subject Kelly to an “administrative measure,” which could include a reduction in rank — and a reduction in his pension entitlement.

“That is not how our democracy works, and we cannot go down that slippery slope,” said Kelly.