 Lawmakers were already livid with the Secret Service for the catastrophic security breach at the rally in Pennsylvania, but cheetle-ducking senators infuriated them even more. Little is known about the gunman Thomas Crooks. Lawmakers find the lack of detail even more vexing. Congress isn't running the only investigation into the security breakdown. The Department of Homeland Security is conducting two probes and the FBI. On Capitol Hill, Chad Pergram, Fox News.