CBS News chief election and campaign correspondent Robert Costa reports from Pennsylvania, where top Republicans are flocking in the final days before Tuesday's red-hot Senate primary election. "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: https://bit.ly/1SUQc68​ Watch full episodes of "Face the Nation": https://cbsn.ws/20pbkSF​ Follow "Face the Nation" on Instagram: https://bit.ly/23Xuhk4​ Like "Face the Nation" on Facebook: https://on.fb.me/23Xmz9E​ Follow "Face the Nation" on Twitter: https://bit.ly/1o3QDQo​ Subscribe to our newsletter: https://cbsn.ws/1RqHw7T​ Download the CBS News app: https://cbsn.ws/1Xb1WC8​ Try Paramount+ free: https://bit.ly/2OiW1kZ For video licensing inquiries, contact: [email protected]