Cameron to Submit Resignation to Queen.
KOSIK: An historic morning unfolding in the United Kingdom. Just hours from now, David Cameron will leave Downing Street for the last time as Britain's prime minister. He's going to head straight to Buckingham Palace to tender his formal resignation. Cameron's replacement, Theresa May, will then be granted an audience with the queen. Let's go live to London and bring in CNN's Robin Oakley. You know, something tells me that Theresa May is going to have little breathing room here, no honeymoon period that many other newly elected officials enjoy. Am I right about that?</s>ROBIN OAKLEY, CNN POLITICAL CONTRIBUTOR: Absolutely so, Alison, yes. And she's facing the difficult task that we expected a leadership contest for the conservative party leadership carrying with it the job of prime minister to last nine weeks, through to September 9th, when her main opponent dropped out of the contest earlier this week, that left Theresa May with a coronation instead of a contest. It also left her with just two days to put together a new cabinet team to replace the one she's been working in with David Cameron, Alison.</s>KOSIK: So, what kind of timetable is she working on? Because at some point, the official process instilling Article 50 of actually having a separation of the U.K. from the E.U. has to be put into play. Is there any indication she's going to do that right away, or will she wait or there's talk that may never happen?</s>OAKLEY: No, it's going to happen. But it's not going to happen quickly. Theresa May has indicated that she's not going to activate Article 50 beginning those negotiations with the European Union until the end of this year at the earliest. So, January 2017 is the earliest we'll see action on that. She will try and have contacts, I think, with other European leaders before that. Although they said no talks until she activates Article 50. There's a bit of a standoff there. But there's one key question to settle, that is 3 million E.U. citizens work and live in Britain. And Theresa May has so far said, well, their future she can't guarantee. They'll have to be part of the negotiations. But there are also 1 million Britons in E.U. countries. So, maybe they can cut a deal on that before the formal talks on Britain's withdrawal begins, Alison.</s>KOSIK: So many unanswered questions, so many question marks with this, because, of course, the Brexit is unprecedented. CNN's Robin Oakley, thanks so much.</s>MARQUEZ: Now, no arrests as police revealed plots to attack officers in Baton Rouge, a city divided by protests in last week's deadly police shooting. What we've learned overnight, coming up next.