securities. >> this president hasn't kept us safe. >> reporter: still their command of some of the defense topics was, well, up for debate. senator ted cruz has said he would launch an indiscriminate bombing campaign against isis, a tactic known as carpet bombing. as opposed to the surgical strikes the u.s. currently uses. >> would you carpet bomb raqqah, the isis capital, where there are a lot of civilians? yes or no? >> you would carpet bomb where isis is. not a city, but the location of the troops. you use air power directed, and you have embedded special forces to direct the air power. >> reporter: but directed strikes, as he calls them, are the opposite of carpet bombing. >> we need a president -- >> reporter: the senator also blamed the obama administration for not identifying social media posts made by san bernardino shooter, tashfeen malik, before being granted a visa to the u.s. >> we didn't monitor the facebook posting of the female san bernardino terrorist, because the obama dhs thought it would be inappropriate.