“[The Islamic State] has a great number of personnel that they’ve recruited, foreign fighters from Western European countries, some of which are in a visa-waiver program,” says The Heritage Foundation’s Steve Bucci. “They have passports that would not flag them for any special attention.”

Watch the full interview on the current situation in Iraq with Daily Signal senior contributor Genevieve Wood and Bucci, director of Heritage’s Douglas and Sarah Allison Center for Foreign and National Security Policy: