supporters in iowa, expected to slam clinton on new e-mails related to her server. the campaign obviously is going to go hard after this. reporter: absolutely. earlier today the steph was telling us he was going to be talking about hillary clinton mails and lo and behold this bomb shell was dropped. i don t think they understood the magnitude. and thinking about scrapping this event because they just wanted to soak the story up. shows you how much they have been waiting for this day. and i can tell you from talking to people over the last several months they are feeling vindicated. if you look back at the e-mail saga and hillary clinton going in and talk ott fbi on july 3rd