>> let's get right to cnn's sunlen serfaty live for us on capitol hill with more on our breaking news. sunlen, good evening to you. we saw some drama play out on the senate floor tonight over the gop tax bill. talk to me about what's going on. >> reporter: there certainly was a lot of drama tonight, don. and i can tell you behind the scenes, right now republican leaders up here on capitol hill are still scrambling, essentially to salvage their tax bill. earlier this evening, there was a moment of high drama on the senate floor where you saw a bob corker, senator bob corker, really surrounded by republican leadership when the vote was being held. there was a lot of debate, a lot of discussion. certainly a moment of intrigue. we now know what was going on at that moment was the senate parliamentarian was telling them essentially killing this idea about a deficit trigger. that's so important, because that was something that was seen as getting bob corker on board, on board with the bill, the deficit trigger, of course, a