"Terror struck the heartland in Chattanooga last month, a sobering reminder that a new generation of extremists is targeting our city streets," says Rep. Michael McCaul, Texas Republican and committee chairman.
"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."