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, with 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 onword, onboard with the bill, the deficit trigger, of course, a trigger that would raise taxes automatically if the growth projections were not met. bob corker was okay with this bill, as long as there was a deficit trigger. that, essentially, got killed tonight. that set off a scramble, because republican leaders are facing