BLITZER: Happening right now, they're wrapping up a very important Senate vote. Potentially could determine the fate of immigration reform. Let's go live to our chief congressional correspondent Dana Bash. What's the latest, Dana?</s>DANA BASH, CNN CHIEF CONGRESSIONAL CORRESPONDENT: The latest is, as you said, the Senate is wrapping up this critical test vote. And it is a test to see just how much support, particularly on the Republican side, immigration reform has. Technically, this is a procedural measure on that deal that we reported on late last week, on implementing more border security, putting more of those measures in place into this bill before the path to citizenship for illegal immigrants can start. So what we're looking at right now is the magic number, how many yeas it gets, because supporters are hoping that they can -- that they can push it up, even close to 70 senators. They hope that if that happens, then they will able to get momentum going into the House of Representatives, which is a lot less receptive to this big immigration reform bill.</s>BLITZER: The problem really isn't in the Senate as much as it is down the road in the House of Representatives, right?</s>BASH: Absolutely. There's no question about it. Obviously it is led by Republicans and you have many Republicans in very red districts who don't want to vote for anything that has anything to do with the path to citizenship. They're worried about it policy-wise and at they're also worried about it politically, about getting challenged from a fellow conservative.</s>BLITZER: All right, Dana. Thanks very much.
Critical Vote on Immigration Reform