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Joe Biden had an interesting exchange with CNN's Jake Tapper on Thursday. Tapper asked Biden how he and presumptive vice president Kamala Harris are getting along these days. Biden said they are getting along just fine.

Biden added that if they have a disagreement, he would fully expect Harris to "develop some disease" and resign -- just as he agreed to do when he was former President Barack Obama's vice president.

"Like I told Barack, if I reached something where there's a fundamental disagreement we have based on a moral principle, I'll, uh, I'll I'll I'll I'll I'll I'll develop some disease and say I have to resign."

He then turned to Harris -- who shook her head no as Biden continued: Uh, we don't have -- that I'm — we haven't — and we've discussed at length our views on foreign policy, on domestic policy, on intelligence."

Biden's supporters say he was "joking." But if he was joking, you couldn't tell by the mortified expression on Harris' face.

Watch Biden's latest gaffe below.