In a video, which the Guardian reports was taken at a Bill & Melinda Gates Foundation meeting, Gates talks about the handful of occasions he's met Trump since the President was elected.

"He knew my daughter Jennifer.” He goes on to describe it as ‘kind of scary’ how much Trump knew about his daughter's appearance, before speaking about some meetings they had later to discuss science and innovation.

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

The footage was released and till our going to the press, Trump had yet to post any angry tweets about it.