Twitter removed a tweet by White House coronavirus task force member Scott Atlas that said masks dont work to stop the spread of COVID-19 , the social media site confirmed Sunday.

Masks work? NO, Atlas, a radiologist with no background in infectious diseases or public health, tweeted Saturday. The post cited the World Health Organization as having said that the widespread use of masks is not supported an interpretation that experts have disputed.

In a follow-up tweet, he said that masks should be used when close to others, especially those who are high risk. He added that there should not be widespread mask mandates, something that other infectious disease experts have advocated.

Atlas initial post about masks not working was removed for violating the sites policy on sharing misleading information about COVID-19, a Twitter spokesperson told HuffPost.