The Deadliest School Shooting Since Newtown

A gunman opens fire on an elementary school in Uvalde, Texas, leaving over 20 people dead. In a special edition of Start Here, ABC's Mireya Villarreal gives an account from the scene, Parkland survivor Sari Kaufman explains what it's like to witness a mass shooting as a child, and law enforcement experts tell Brad what officials need to do to prevent another tragedy.  Learn more about your ad choices. Visit megaphone.fm/adchoices