Today on AirTalk, we get the latest on Saturday\u2019s shooting at a Trump rally in Butler, Pennsylvania and talk about the response from American leaders, the history of violence in American politics, and how the Republican National Convention is preparing. Also on the show, Larry Mantle talks with author Mark S. Walton on his new book \u2018Unretired: How Highly Effective People Live Happily Ever After;\u2019 we examine how summer jobs for teenagers have changed; and more.