A top psychologist has warned that 79-year-old Donald Trump’s increasingly erratic behavior likely points toward a personality disorder being rapidly worsened by dementia.

“When people develop dementia, they become the worst versions of themselves,” Dr. John Gartner—a therapist, activist, author, and former professor at Johns Hopkins—told Joanna Coles Sunday on the latest episode of The Daily Beast Podcast.

Gartner has previously shared with the show how he sees the aging president’s verbal gaffes, growing confusion, and frequent memory lapses as “clinical signs of dementia,” which have in turn exacerbated what he believes to be Trump’s underlying “malignant narcissism.”

“Whatever personality issues or problems [people with dementia] have begin to deteriorate and they become even more

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