How U.S. is countering Islamic extremist propaganda machine

President Obama reiterated his promise to destroy the virulent Islamic State Tuesday. More

President Obama reiterated his promise to destroy the virulent Islamic State Tuesday while talking about the Orlando mass shooting — and how gunman Omar Mateen, a U.S. citizen, may have been radicalized by online extremist propaganda. NewsHour producer P.J. Tobia reports on U.S. efforts to win the hearts and minds that the terrorists are trying to co-opt on the Internet.

AIR DATE 6/14/16