Trump, Biden prepare to square off in first presidential debate

The Beat with Ari Melber - A podcast by Ari Melber, MSNBC

MSNBC's Ari Melber hosts "The Beat" on Thursday, June 27 and previews the first presidential debate in Atlanta. Rev. Al Sharpton, Alex Wagner, Stacey Abrams, Joe Trippi, Robert Barnett join.