Former CDC director Dr. Tom Frieden joins "GMA" to discuss the new CDC guidance. SUBSCRIBE to GMA https://bit.ly/2Zq0dU5 VISIT: http://www.goodmorningamerica.com Watch full episodes of GMA on Hulu: https://abcn.ws/3bzvQQn Follow GMA across the web-- Facebook: https://www.facebook.com/GoodMorningAmerica Twitter: https://twitter.com/gma Instagram: https://instagram.com/goodmorningamerica #GMA #CDCGuidance #BackToSchool