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And even more striking, even 13% are very confident that the u.s. will be able to identify terrorists among the refugees. sunlen serfati, cnn, des moines, iowa. >> all right. so let's bring in the panel and talk more about this. in washington, cnn's senior political analyst and editorial director of the "national review," ron brownstein, good to see you. and cnn politics senior reporter, steven collins. and with me here in atlanta, cnn analyst, joey jackson. hello to you. so the candidates using very strong language to lay out their positions on isis and the refugee crisis. donald trump saying...

All right, since the terror attacks in paris one week ago, the fight against isis has become a major election issue in the u.s., but it's what some of the candidates are saying that is fueling a debate about the fight on terror and how the u.s. should deal with refugees. our sunlen serfati is following that story. >> very simply, we can't take them, folks. we can't take them. >> reporter: it's a debate roiling in the republican party. how to handle the resettlement of syrian refugees in the wake of the paris attacks. donald trump drawing a hard line, refusing to take any option off the table t...

That's where we find cnn national correspondent sunlen serfati. so, sunlen, he's in puerto rico this weekend after south florida swing. what's happening since that press conference last night? >> reporter: well, inlg, fred, if last night is any indication, the tone that he took in that press conference is really a window into how ben carson is thinking right now. it's very clear that he is frustrated with the scrutiny over his past. it definitely is getting under his skin. and we saw him in that press conference really bring a side to him we have not seen before. he was aggressive and he was c...

These questions swirl around, but i should note, these are legitimate questions, ones that we still do not have answers for. now, he did push back fiercefully during that press conference last night. and afterwards at a late-night event, he made mention to this new tone he's taking. he said, a lot of people assume i'm quiet, and because i'm quiet, they think i'm soft. but i think people are now starting to learn that i can be loud, and in his words, particularly when injustices are being done. >> sunlen serfati, gorgeous backdrop, by the way, thank you so much, traveling with dr. carson. let's...

All right. it's a big weekend on the campaign trail. ten gop presidential candidates are stumping in iowa alone. and tomorrow, several of the campaigns will meet in washington to see if they can take more control of the upcoming debates from the republican national committee. let's go to cnn's sunlen serfati in iowa. sunlen, is this kind of dominating discussions and thoughts there, that many of these campaigns say they want to get together without the rnc's involvement to talk about how they want upcoming debates constructed. >> reporter: that's right, fred. and many of the candidates who are...