MSNBC’s Joe ScarboroughCharles (Joe) Joseph ScarboroughControversial radio host Don Imus dies at 79 Scarborough: 'Teflon Joe' Biden weathering storm amid Warren's 'political bleeding' Richard Haass to Scarborough: Thursday 'one of Donald Trump's best days as president' MORE on Thursday sharply criticized Sen. John KennedyJohn Neely KennedyMORE after the Louisiana Republican called Speaker Nancy PelosiNancy PelosiWhite House appoints GOP House members to advise Trump's impeachment team House revives agenda after impeachment storm Democrats worry a speedy impeachment trial will shut out public MORE (D-Calif.) “dumb” at a rally the previous night.

Kennedy, during the rally headlined by President TrumpDonald John TrumpSanders apologizes to Biden for supporter's op-ed Jayapal: 'We will end up with another Trump' if the US doesn't elect progressive Democrats: McConnell impeachment trial rules a 'cover up,' 'national disgrace' MORE in support of gubernatorial candidate Eddie Rispone (R), referenced Pelosi proceeding with the House impeachment inquiry, saying, “I don’t mean any disrespect, but it must suck to be that dumb.”

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Scarborough, a former GOP congressman and vocal Trump critic, ripped into the comment on Thursday, asserting that the senator "actually does mean disrespect and he has degraded himself.”

“I just wonder how low these people are going to go ... how much they’re going to degrade themselves,” Scarborough said on MSNBC’s “Morning Joe.”

The MSNBC host argued that the remark would be a defining moment for Kennedy, who has come out to defend Trump amid the mounting impeachment investigation in the House focused on the president's dealings with Ukraine.

“By the way, senator, guess what? No matter what you do for the rest of your life, that’s your moment,” Scarborough said, adding "you did it for a man who committed crimes.”

Scarborough himself recently caught flak after he criticized attendees at a World Series game who had gone after the president by chanting "lock him up" at him. Trump was in attendance at the game.

The MSNBC host said that Americans “do not do that” and called it “un-American.” Social media users later defended the attendees' behavior, with “Sorry Joe” later trending on Twitter.