within russia according to the chairman of a committee in the british parliament. this potentially has big implications here in the u.s. in light of russian interference in the last presidential election. here's cnn's senior investigative correspondent drew griffin. >> reporter: it was marketed as a breakthrough in how to motivate, change people's minds, and manipulate them to vote or not vote in an election. using the personal facebook data of tens of millions of americans, cambridge analytica developed a voter-targeting technique aimed at specifically targeting individual voters who would receive messages on their facebook feeds, group chats and even personal communications, and it turns out the russians were paying attention. >> the information commissioner in the uk is saying that she believes that the cambridge analytica facebook data was accessed by people in russia, and we don't yet know -- >> in russia? >> in russia. we don't yet know who they were and what they accessed and whether they took that data or what they did with it. but that link has been established through the investigation. so clearly it will be really important to understand exactly what the level of access was of