MSNBC’s Joe ScarboroughCharles (Joe) Joseph ScarboroughSaagar Enjeti: Republicans lost Kentucky by failing to appeal to working class Scarborough knocks GOP senator for Pelosi remark: He 'degraded himself' TYT's Cenk Uygur rips Dems condemning Trump 'lock him up' chant: 'Most feckless party' ever MORE on Thursday sharply criticized Sen. John KennedyJohn Neely KennedyMORE after the Louisiana Republican called Speaker Nancy PelosiNancy PelosiImpeachment week: Trump probe hits crucial point Klobuchar: 'I have seen no reason why' Hunter Biden would need to testify Johnson dismisses testimony from White House officials contradicting Trump as 'just their impression' MORE (D-Calif.) “dumb” at a rally the previous night.

Kennedy, during the rally headlined by President TrumpDonald John TrumpThis week: House kicks off public phase of impeachment inquiry Impeachment week: Trump probe hits crucial point Judd Gregg: The big, big and bigger problem 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.