cnn's pamela brown starts us off tonight. what are you learning first of all about this resignation? >> reporter: we've learned the white house, the resignation of volker -- sorry, is that what you're asking me about? >> actually, let's start with how the conversations themselves were handled. >> reporter: the conversations, okay. there's a lot of news, anderson. conversations because we have learned that efforts to limit access to president trump's conversations with foreign leaders extended to phone calls with crown prince mohammed bin salman and russian leader vladimir putin, according to people familiar with the matter. now, those calls were among the presidential conversations that aides took remarkable steps to keep from becoming public. in the case of trump's calls with prince mohammed, officials who ordinarily would have been given access to a rough transcript of the conversation never saw one according to one of the sources. instead, anderson, a transcript was never even circulated at all, which the source said was highly unusual, particularly after a high-profile conversation like that one. now the call which the person said contained no especially