President Joe Biden has referred to his debate performance as a "bad night". Photo: Evan Vucci/AP
President Joe Biden's personal doctor met with a top neurologist at the White House this year, it has been reported.
Visitor logs viewed by the New York Post showed Dr Kevin Cannard, an expert in Parkinson's disease, met with Biden's physician Dr Kevin O'Connor on 17 January.
Cannard is based at Walter Reed National Military Medical Centre in Maryland, where he has worked for nearly two decades.
According to his LinkedIn profile, he has served as the "neurology specialist supporting the White House Medical Unit" since 2012,
Walter Reed cardiologist Dr John E. Atwood was also in the 5pm meeting, the New York Post reported the visitor logs as showing.
The publication had not been able to identify a fourth person who attended the meeting.
The revelation comes amid speculation over Biden's health and cognitive abilities following a disastrous debate with former president Donald Trump.
Calls have been mounting for the 81-year-old to step aside ahead of the presidential election on 5 November, with some insiders saying he is not capable of beating Trump.
In an interview with ABC News aired this weekend, Biden called the debate a "bad episode", but was resolute that he was the best person to contest the presidency..
"No indication of any serious condition. I was exhausted. I didn't listen to my instincts in terms of preparing and - and a bad night," Biden told ABC News anchor George Stephanopoulos in a taped interview.
"I just had a bad night. I don't know why."
The New York Post spoke to Republican representative Ronny Jackson, who was the doctor for both president Barack Obama and Trump.
He said Biden's health was O'Connor's primary responsibility, so it was "highly likely" his meeting with Cannard was about the president.
"He should only be [regularly] treating the president and the first family."
The New York Post said O'Connor gave Biden a clean bill of health at his annual physical back in February.
That included neurological checks which specifically ruled out Parkinson's, O'Connor said at the time.
Cannard and Atwood both declined to comment when approached by the publication.
"A wide variety of specialists from the Walter Reed system visit the White House complex to treat thousands of military personnel who work on the grounds," a White House spokesman said.