Biden was taking part in an interview with a group of Black and Latino journalists.
"No, I haven’t taken a test. Why the hell would I take a test?" Biden replied. "C'mon man, that’s like saying, 'You — before you got on this program you took a test where you’re taking cocaine or not, what do you think? Huh? Are you a junkie?'"
"If he can’t figure out the difference between an elephant and a lion, I don’t know what the hell he’s talking about," Biden said laughing at Trump. "Look, c'mon man, I know you’re trying to goad me... And by the way, as I joked with -- you, know, I probably shouldn't say."
"I am willing to let the pubic judge my physical as well as mental fitness," he said.