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>> i don't think so. >> reporter: with just four days remaining until the caucuses, the remaining republican candidates say nikki haley and ron desantis will be holding big campaign events like this one, trying to find those last minute last-minute undecided voters. former president donald trump is set to be back here holding rallies by the weekend. norah? >> norah: ed o'keefe on the campaign trail there in ames, thank you so much. want to turn out as a breaking news, the u.s. and the united kingdom are beginning to strike houthi targets in yemen. the iranian-backed militia has launched a constant barrage of drone and missile attacks at ships in the red sea, delaying shipping globally. cbs's nancy cordes has the very latest now from the white house. good evening, nancy. what do we know? >> reporter: good evening, norah. moments ago cbs news confirmed these joint air strikes by the u.k. and the u.s. on military positions in yemen are now underway. this marks the first time the u.s. has fired on yemen since the israel-hamas war began in