for the -- >> large truck careens through crowds of tourists -- >> a crowded cafe -- >> kills at least 30 people in belgium. >> soon they'd mount some of the deadliest terror attacks since 9/11. 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 islamic state? his critics point to a pivotal decision. leaving iraq with just a handful of troops. his generals had wanted