Introducing the CNN Political Briefing

A night of powerful women and big names are set to speak at the DNC, including Kamala Harris, Hillary Clinton, and Barack Obama. Join CNN Political Director David Chalian for his insights on what you can expect from the third night of the convention. Plus, after months of undermining voting by mail, the president’s trying to save face with his most recent message about mail-in ballots to his supporters and a new bipartisan Senate report says 2016 Russian election interference was not a hoax.