SHIMON PROKUPECZ, CNN CRIME & JUSTICE REPORTER: We are now in the second phase of this trial, Ana, where prosecutors will outline very important and probably the most crucial point of this trial and really the most crucial point of why Roger Stone was charged and arrested. It's now the phase concerning Roger Stone's contacts with the Trump campaign and his knowledge about WikiLeaks and what he was communicating to the campaign and claiming he was going to be able to get him some of the emails and information. That is where Steve Bannon will play a big role. He's expected to testify about emails and about communication that he had with Roger Stone where Roger Stone was claiming to have access and information concerning what WikiLeaks was working on and some of the emails they were going to release. Specifically, there was one email that Roger Stone said to Steve Bannon saying that he knew how to win, that it wasn't going to be pretty. And then Steve Bannon responded, "Let's talk ASAP." That is what he's going to testify. It is probably "the" most crucial part of this case that is now getting under way at this afternoon -- Ana?</s>ANA CABRERA, CNN HOST: Shimon Prokupecz, thank you. Keep us posted. More on the breaking news. Any moment, in the impeachment inquiry of President Trump, two witnesses now tying quid pro quo efforts straight to the White House. Why chief of staff, Mick Mulvaney, is now one of the people at the center of this scandal. Stand by.
Steve Bannon Takes Stand at Roger Stone Trial