Joe Biden is pushing back at Republican assertions that he should take a cognitive test to disprove President Donald Trump’s claim that the Democrat is not fit for the Oval Office.
Mr Biden was irked when CBS News correspondent Errol Barnett asked the presumptive Democratic presidential nominee about the matter in a recent interview.
Why the hell would I take a test?
“No, I haven’t taken a test? Why the hell would I take a test?” Mr Biden said.
He then told Mr Barnett: “That’s like saying … before you got on this programme, you’re taking a test whether you’re taking cocaine or not.
“What do you think? Huh? Are you a junkie?”
The former vice president, who is 77, also tried to turn the matter back around on the 74-year-old president in the latest jousting over the two men’s fitness for office.