Dr. Phil Unsettled Over Biden's Doc Giving Him Cognitive All-Clear |

Dr. Phil isn't afraid to voice his concerns about a red flag in the political arena -- and that'd be Joe Biden's apparent difficulty remembering things ... and his cognitive ability at large.

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The TV star and medical professional stopped off at "TMZ Live" Thursday to chat about his new book, "We've Got Issues: How You Can Stand Strong for America's Soul and Sanity" -- and the convo eventually turned to Biden's doctor recently claiming he was fit for duty without needing a physical or neurological exam.

He declared this with conviction, despite many public examples of him forgetting basic deets.

Of course, Biden's all-clear raised eyebrows among some -- including Phil ... who tapped into his days practicing in brain, central nervous system, and cognitive ability fields to weigh in on the situation.

With this in mind, he tells us POTUS if didn't have anything to hide regarding his brain power, he would theoretically have no issue undergoing a transparent neurocognitive test.

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Biden's memory loss has become prime material for online roasting sessions -- especially among Republicans -- and even Jon Stewart couldn't resist taking a jab at him during his recent "The Daily Show" return to the hosting chair.

In fairness, JS also went after his opponent -- roasting Trump for being unable to remember basic stuff ... which is a pretty crucial trait to have if you're running the country.

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Just don't ask Dr. Phil to throw his hat into the presidential ring anytime soon. He tells us he's been approached for the important gig several times, but he just doesn't know enough about politics to take it all seriously. With that said, he is exploring politics more lately.

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It's probably a good call to recognize where your strengths lie and where you might need to sit things out. Phil's very self-aware, and as wise as ever here.