Watch: Bill Gates Says Trump Asked Him the Difference Between HIV and HPV...Twice

During a recent "Bill & Melinda Gates Foundation" meeting, Microsoft cofounder Bill Gates said that President Donald Trump asked him twice the difference between HIV and HVP during their March 2017 meeting.

Footage of the billionaire's comments were posted by MSNBC's "All in with Chris Hayes" on YouTube. In the clip, also broadcast Thursday, Gates took questions from staff and told the audience about how Trump once encountered his daughter Jennifer, now 22, during a horse show in Florida.

"And then about 20 minutes later he flew in on a helicopter to the same place," Gates said. "So clearly he had been driven away but he wanted to make a grand entrance in a helicopter."

He added that he met Trump for the first time in December 2016.

"So when I first talked to him it was actually kind of scary how much he knew about my daughter's appearance," he said. "Melinda [Gates's wife] didn't like that too well."

Gates then recalled the meetings from March 2017 at the White House.

"In both of those two meetings, he asked me if vaccines weren't a bad thing because he was considering a commission to look into ill-effects of vaccines and somebody - I think it was Robert Kennedy Jr. - was advising him that vaccines were causing bad things," he said. "And I said, 'No, that's a dead end, that would be a bad thing, don't do that.'

"Both times he wanted to know if there was a difference between HIV and HPV so I was able to explain that those are rarely confused with each other," Gates added.

Watch the clip below.