all of their in-person events in iowa less than 72 hours out from the critical first vote in the nation. the extreme weather and subzero temps upending their plans. >> plus, new u.s. strikes against iranian backed militants in yemen tonight hours after president biden said he had delivered a message to iran with that barrage of strikes last night. the question now is is escalation inevitable? also potential complications for the trump case in georgia. allegations of an improper relationship between the fulton county district attorney and her lead prosecutor, and a judge is now looking into the matter. i'm kaitlan collins. and this is "the source." we are now down to the crucial final three days before the first vote in the nation, and right now the republican