powell beban has our report. >> with the race entering the final stretch before the iowa caucuses on february 1, the stakes were high in las vegas. nine presidential candidates deep baited who would be tough on terrorism and protecting americans. donald trump and his plan to bar muslims from the united states drew fire from all the other candidates. but former florida governor jeb bush was itching for a fight. >> he's a chaos candidate and would be a chaos president. he would not be the commander in chief we need to keep our country safe. >> jeb doesn't really believe i'm unhinged. he said that simply because he has failed in this campaign. it's been a total disaster. nobody cares. >> trump and bush weren't the only ones sparring. senators marco rubio and ted cruz went after each other on national security and immigration. legalizing people that are in this country now? >> i have never supported legalization and i do not intend to support legalization. >> new jersey governor chris christie saw an opening, using the senator's bickering to tout his executive experience. >> this is the