Dr. Anthony Fauci said the United States may want to consider mandates for masks if people don’t start wearing face coverings.

Fauci, the director of the National Institute of Allergy and Infectious Diseases, appeared on CNN Friday evening and was asked about Joe Biden’s plan to try to get the country to expand its mask mandates. Biden has said that he would “go to every governor” and urge mandates, “and if they refuse, I’ll go to the mayors and county executives and get local masking requirements in place nationwide.”