WASHINGTON, JULY 1, 2020 (Xinhua) -- Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, arrives to testify before the U.S. Senate Committee on Health, Education, Labor and Pensions on COVID-19: Update on Progress Toward Safely Getting Back to Work and Back to School in Washington, D.C., the United States, on June 30, 2020. Anthony Fauci, the U.S. governments top infectious-diseases expert, warned Tuesday that COVID-19 cases in the United States could go up to 100,000 per day if the current trend does not turn around.