On Saturday, Thomas Matthew Crooks attempted to assassinate former president Donald Trump. Crooks got on top of a roof near the Butler, Pa., rally and shot toward the rally stage. But almost a minute and a half before Crooks fired, bystanders alerted security that they saw a man on a roof.Since the assassination attempt, the Secret Service – the organization meant to protect current and former presidents – has been under scrutiny. Today, guest host Chris Velazco speaks with investigative reporter Carol Leonnig about the Secret Service – how they work, their past failures and how they responded at the scene. Today’s show was produced by Sabby Robinson and Ali Bianco. It was edited by Reena Flores and mixed by Sean Carter. Thanks to Peter Wallsten and Isaac Stanley-Becker.Subscribe to The Washington Post here.