Dr. Anthony Fauci admits telling President Trump 'things he doesn't want to hear' can be risky after he garnered a reputation for contradicting him publicly 

'If he's gonna get pissed off, he's gonna get pissed off,' he told the New York Times 'All you need to do is continually talk about what the data are'

But he insisted Trump is 'a smart guy', adding: 'He's not a dummy'

 The top doctor said he had been surviving on three hours sleep a night

Rumors of tension between Trump and the immunologist have been circulating

The director of the National Institute of Allergy and Infectious Diseases was caught smirking at Trump during a coronavirus press conference on Friday