Gupta, a practicing neurosurgeon, expressed concerns about Biden’s physical and mental condition following his debate with Trump last week. In his observations, Gupta pointed out Biden’s halting speech, confused statements, lack of concentration, rigid movement, and diminished facial expressions.

“For me as a brain specialist, it was concerning to watch President Joe Biden, and it quickly became clear that I was not alone in my reaction,” Gupta wrote. “Over the past week, I received more than a dozen calls, texts and emails from medical colleagues who, like me, specialize in the brain. It wasn’t that what we noticed was necessarily new but that it was particularly pronounced, and right from the start of the debate.”

Gupta referenced Biden’s most recent physical exam in February, conducted by a team of 20 doctors led by current White House physician Dr. Kevin O’Connor, including a neurologist. This “extremely detailed” neurological exam showed no signs of neurological disorders nor evidence of Parkinson’s disease, which might have accounted for Biden’s stiff gait and reduced facial expressions noted during his debate.

However, Gupta pointed out in his op-ed that no cognitive testing was performed at the time. He suggested that comprehensive testing is necessary to determine whether there is a straightforward explanation for Biden’s symptoms during the debate or if there is a more serious underlying issue.