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Attacks, the focus is national security. and what will each of these candidates bring to the oval office as commander in chief? i mean, you know, we asked -- you asked a wide range of topics. and there are of course a host of topics and issues that will be important for any president, but right now at this moment in time americans are scared and want to know how the next president is going to keep them safe. >> obviously we don't want to tip our hands as to what the questions will be asked, but there are some -- and i would guess and i don't know because i've been kept out of the process. but ...

The cruz headquarters in part because we were interested in the same question you are. how did the freshman texas senator cut through this big field of candidates and come up with now what appears to be a leading position by some polls in iowa and doing very well in some other states as well. and part of it was by really studying the electorate, relying on data and making sure that the candidate's message was in a sense tailored to the concerns or the personality even of individual voters. the notion being that if you can tailor the language and the approach, you'll have a better chance of win...

Who among the candidates will voters trust to protect them to be strongest on national security? donald trump still leads national polls, but new numbers show ted cruz closing in. and when you look just at iowa, cruz tops trump in one poll. another poll shows cruz neck and neck with trump in iowa. the state that will hold the first presidential contest in just seven weeks. cnn's john berman is with me here in vegas. and, john, as usual donald trump is not waiting for the debate stage to be set for him. he's already out on the trail throwing some elbows, making his case. >> yeah. he called ted ...

>> thank you, jake. great to be back. >> so i have to ask you, alice stewart, your campaigns communications director just announced she's leaving the campaign. usually staffers leaving not a great sign for any campaign, what's behind her resignation? >> well, you know, we got dozens of people in many states working for us. we hate to lose alice, but she's decided that she's i think exhausted from the campaign. she's left. it's her decision. but like in any organization people leave cnn from time to time, the network still signs on the next day. so we're moving forward. and i think if people tr...

Ease holiday fears saying the u.s. is hitting isis harder than ever. how do republicans plan to hit back? plus, she reportedly said she supported violent jihad and wanted to be a part of it. she said this on social media before the u.s. gave her a visa. how did one of the san bernardino terrorists get through background checks with comments like that online? welcome to "the lead." i'm jake tapper. we are live from the ve negs hotel in las vegas. tomorrow's republican presidential debate is a whole new ball game since the candidates last debated. terrorism has returned to center stage. in f...