Overview: AOC formally endorses Bernie Sanders. Emma Vigeland LIVE on attending Bernie's NYC rally, which was the largest campaign event of the primary season yet. Updates on US troops withdrawal as the 'ceasefire' ends today. Chris Wallace grills Mick Mulvaney, who has been struggling to do damage control all weekend. Mitt Romney has a secret Twitter account where he acts as his own pro-Romney bot. A NJ school district is banning kids with lunch debt from attending prom and field trips.