"The new sort of threat that's out there over the Internet that's very hard to stop. We have 200,000 ISIS tweets per day that hit the United States," Rep. Michael McCaul, Texas Republican and chairman of House Homeland Security Committee, told ABC News Sunday. "The chatter is so loud and the volume so high that it's a problem that's very hard to stop and disrupt in this country. It's something we've been warning about over the last year. And unfortunately we saw it take place in Chattanooga."
Federal authorities have obtained computer and cellphone devices belonging to the 24-year-old man who shot and killed four Marines in Chattanooga, Tennessee, Homeland Security Committee Chairman Michael McCaul said Friday.