most barbaric ways imaginable. their philosophy may have been medieval, but they were masters of the internet. >> come to jihad. >> brother in islam and syria. i originally come from canada. >> luring recruits from malaysia to belgium to new jersey. >> isis claiming responsibility for the -- >> large truck careens through crowds of tourists -- >> bullets fired into a cafe. >> kills at least 30 people in belgium. >> soon they'd mount some of the deadliest terror attacks since 9/11. >> stay down. stay down. >> casting a large shadow over obama's presidency -- >> to solve a problem -- >> and an even larger one over the presidential election. >> the way they got out of iraq, the vacuum they've left, that's why isis formed in the first place. and now they're in 32 different nations, hillary. congratulations. great job. >> so could president obama have prevented the rise of the