India, July 2 -- Questions about Donald Trump's cognitive decline are a widespread topic now, with one mental health expert raising concerns that the 79-year-old U.S. president may be showing signs of early-stage dementia.

Dr. John Gartner, a psychologist and long-time observer of presidential behaviour, during an interview on The Dean Obeidallah Show, suggested that Trump could be battling frontotemporal dementia, a condition that impacts both speech and motor functions.

"When we talk about deterioration from dementia, I was focusing on language because that's the thing we most observe, but also we always see deterioration in motor performance," he said.

Gartner's observations aren't based on just one incident or clip. He highlighted ...