India, June 26 -- Fred Trump III, nephew of President Donald Trump, pointed to a troubling family history of dementia while voicing concerns about his uncle's mental fitness.

Fred, who recently authored All in the Family: The Trumps and How We Got This Way, didn't mince words during a recent appearance on The Dean Obeidallah Show on SiriusXM and spoke about worrying signs of cognitive decline in the 45th U.S. President.

"I know what I saw in my grandfather," Fred said, referring to Fred Trump Sr. , Donald Trump's father, who lived with Alzheimer's for eight years before passing away in 1999. Fred III claimed the elder Trump's health was far from what Donald had publicly said.

"You know, Donald said, 'Oh, my father was tiptop until the ...