Dr. Anthony Fauci, chief medical adviser to President Biden, said Sunday that it's "inexplicable" why some Americans continue to resist getting vaccinated against COVID-19 despite information showing those who have not received their shots are at a higher risk of becoming infected with the Delta variant. "Face the Nation" is America's premier Sunday morning public affairs program. The broadcast is one of the longest-running news programs in the history of television, having debuted November 7, 1954 on CBS. Every Sunday, "Face the Nation" moderator and CBS News senior foreign affairs correspondent Margaret Brennan welcomes leaders, newsmakers, and experts to a lively round table discussion of current events and the latest news. Subscribe to the "Face the Nation" YouTube channel: http://bit.ly/1SUQc68​ Watch full episodes of "Face the Nation": http://cbsn.ws/20pbkSF​ Follow "Face the Nation" on Instagram: http://bit.ly/23Xuhk4​ Like "Face the Nation" on Facebook: http://on.fb.me/23Xmz9E​ Follow "Face the Nation" on Twitter: http://bit.ly/1o3QDQo​ Subscribe to our newsletter: http://cbsn.ws/1RqHw7T​ Download the CBS News app: http://cbsn.ws/1Xb1WC8​ Try Paramount+ free: https://bit.ly/2OiW1kZ For video licensing inquiries, contact: [email protected]