COOPER: Pivotal day across the pond. Voters decided whether United Kingdom should leave the European Union, a referendum with enormous implications, not just for the UK. The vote counting has started. The final result is not expected to be announced until Friday morning. Our Chief International Correspondent Christiane Amanpour joins me now with the latest. Christiane you have been following this closed and after a long time, the polls closed nearly five hours ago. Any sense at which way the voters leading?</s>CHRISTIANE AMANPOUR, CNN CHIEF INTERNATIONAL CORRESPONDENT: It is being a really, really knife edge see-saw for the last several hours. You know, before results formally started coming in, there was expectations that remain would win in the close vote of the pound serge. Well in the intervening several hours, we've had a lot of leave, leave the EU votes being counted from North of England, some from the southeast. I'm going heavily towards leave. Now, as I'm talking to you right now remain is meniscally microscopically ahead and we simply don't know where this is all going to end. The big, big question is the turnout and how London will do, and whether the margins in London are enough to offset those in the north which have gone for leave. Every course in every vote counts and this is -- it's a referendum. It's not general election. It's literally every vote counts.</s>COOPER: Yeah, I was just working in France yesterday and there are a bunch of British citizens around me who had made sure to vote before they left in order to get their vote convict because it's really is that close. And Christiane, the Obama administration clearly wants UK to stay in the EU. Can you just talk a little bit about why this vote matters for the United States? I mean, is that simply economics, security related? Is it all of the above?
Polls Close In Brexit Vote, Awaiting Results