On May 31, Bob Schieffer will sign off as host of CBS’ “Face the Nation.” It marks the end to 46 years at CBS News, 24 of which were spent at the helm of the Sunday show. Even as TV news viewership is on the decline, “Face the Nation” with Bob Schieffer still drew more than 3 million viewers a week, outperforming the competition. In a world of short sound bites and even shorter attention spans, Schieffer remains convinced that the Sunday shows still provide a valuable service: In-depth one-on-one interviews with Washington newsmakers. Veteran newsman Bob Schieffer joins Diane to talk about his career, his retirement and the future of journalism.