Dr. Anthony Fauci, the nation's top infectious disease expert, said Sunday the coronavirus outbreak in the U.S.

The country's largest nurses' union is blasting the CDC over its latest recommended easing of mask restrictions - claiming the move threatens the lives of patients, nurses and other front-line workers.

Centers for Disease Control Director Dr. Rochelle Walensky insists that the new coronavirus guidance is solely based on science and not the product of pressure from politicians.