The son of former President Ronald Reagan argued in an interview Thursday that President Trump isn't acting like a commander in chief.

Ron Reagan, a radio host and MSNBC contributor, said on MSNBC's "Hardball" that it was "extraordinary" to hear Democrats and others openly questioning the president's mental stability.

"Think about how extraordinary it is that we're even having this conversation," Reagan said. "You and I have differences with various presidents. I've been very tough on George W. Bush on torture and things like that, but we're actually talking about the president's very sanity here, and doing it in a serious way."

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White House press secretary Sarah Huckabee Sanders on Thursday rejected remarks from Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) last week questioning Trump's "stability" and "competence" for the presidency. Sanders called the comments "ridiculous and outrageous."

Reagan later Thursday argued there was "good reason" to question Trump's stability, arguing that the president's own statements beg the question.

"We're really, genuinely worried, and with good reason," Reagan said. "Very sober people are worried that this man is simply unfit for office, characterologically, emotionally, mentally. He does not have the stability, it seems."

Reagan told host Chris Matthews that Trump isn't just acting abnormally, he is acting "pathological in his behavior."

"You can't control a president who is pathological in his behavior," Reagan said. "It's not that he's just not behaving like a normal president does, he's not behaving as a normal grown-up does."

"He doesn't have the sort of human instincts, whether it's Charlottesville, or something else, the Boy Scouts for God's sake, talking about going out on a yacht with a lot of women," Reagan added. "The guy with a lot of money, to the Boy Scouts, who does this? What adult would stand there and say that?"