data helped put donald trump in the white house. we're going to talk to the former research director for the firm, 28-year-old christopher wyl wylie, who blew the whistle on the whole thing. i want to ask you about professor kogan, who created the personality test app, that harvested this data for cambridge analytica. do you think any of the information he collected went back to russia, christopher? >> well, what i do know is that professor kogan, who managed this data harvesting scheme of 50 million americans, was going back and forth between london and russia working at st. petersburg university on russian-funded programs to look at psychological profiling, and indeed talking about, you know, the value of social data in political targeting. >> trust me. you don't want to miss that. stick around for more from christopher wylie in just a moment. i want to bring in pamela brown.