Letter to the Hon. Alex Azar, Secretary of the Dept. of Health and Human Services, the Hon. Betsy DeVos, Secretary of the Dept. of Education, and Dr. Robert Redfield, Director of the Centers for Disease Control and Prevention - U.S. Senators Tina Smith, Elizabeth Warren Call on Agencies to Provide "Complete, Transparent, and Timely National Reporting of COVID-19 Cases" in K-12 Schools