heilemann at the russian tea room where he admits to having a mutual friend and a back channel to julian assange. so, is there something more here to come out from roger stone and his behavior behind the scenes? >> well, he has repeatedly said that they have a mutual friend that he has received information from and stated it as a legal back channel, and so, he says that he's done nothing wrong here. i think the key thing is that he does not work at the white house. he did not work for donald trump after 2015. he was dismissed. and so, if that is the case, it's not clear how often he is talking to president donald trump or white house staffers at this point and what people at the white house may know as a result of his conversations. >> all right. we'll wait to see what comes out of all of this. again, that date to circle, march 20th. francesca, thanks so much. pema, thank you. appreciate your time. another question we'll be exploring in a bit, white house democrats are threatening to pull out altogether of the russian investigation.