Joe Biden was caught in yet another embarrassing situation during an on camera appearance as he stumbled over his words while asserting that he didn't need to take a cognitive test.

President Donald Trump has turned Biden's mental faculties into a campaign issue, prompting condemnation from the media and yet Biden's own verbal slip ups continue to provide material for such claims.

During an interview with the National Association of Black Journalists and National Association of Hispanic Journalists, Biden was asked if he would take a cognitive test to prove Trump wrong.

"No, I haven't taken a test. Why the hell would I take a test?" responded Biden.