First, Chris discusses Biden's message of "national unity" in his 9/11 message to America with David Gregory. Then, Chris goes one-on-one with retired firefighter who responded to 9/11 attacks, Rob Serra. Chris wraps up the show with an Afghan family reunited in the U.S. after escaping Kabul with the help of a U.S. veteran. To learn more about how CNN protects listener privacy, visit cnn.com/privacyLearn more about your ad choices. Visit podcastchoices.com/adchoices