Former Microsoft CEO and co-founder Bill Gates recalls in newly revealed footage how President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE once left an equestrian event in Florida and returned in a helicopter to make what Gates described as a "grand entrance."

In a video obtained by MSNBC and aired Thursday night on "All In with Chris Hayes," Gates can be heard telling an audience about his personal experiences with Trump, whom he said he met only after the real estate mogul won the 2016 election.

But Gates recalled that Trump spoke with the Microsoft CEO's daughter Jennifer at an equestrian event in Florida, and was "super nice."

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"But then, twenty minutes later, he flew in in a helicopter to the same place, so clearly he had been driven away and he wanted to make a grand entrance in a helicopter," Gates said in the clip.

Never before seen footage obtained exclusively by All In shows Bill Gates discussing meetings with Donald Trump #inners pic.twitter.com/GouJwYKghi — All In w/Chris Hayes (@allinwithchris) May 17, 2018

Gates also discussed his first time meeting Trump himself shortly after Trump won the presidential election. At that meeting, in Trump Tower, Gates said he advised Trump to "be associated with innovation."

Gates met with Trump once again in March 2017, this time at the White House. In both encounters, Gates recalled, Trump asked him whether he believed vaccines were dangerous.

"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," Gates said.

Trump has repeatedly questioned the need for vaccines, and has repeated a debunked theory that they are linked to autism in infants and young children.

Gates also said that Trump asked him during one of their meetings what the difference between HIV and HPV was.

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