AYMAN MOHYELDIN (ANCHOR): Angelo, I know that you guys over at Media Matters have looked at how the Trump campaign used Cambridge Analytica. What have you guys found out?

ANGELO CARUSONE (MEDIA MATTERS PRESIDENT): So there's two things that I would point out as the way they used it. One is they used it for advertising. So they used the data in part to help engage in what was essentially a suppression or a neutralization campaign -- sort of target voters that are unlikely to vote for Trump or likely to vote for Hillary Clinton -- with deceptive messages or, in some cases, completely fabricated storylines to just keep them home, right? To depress their vote. But the second thing I think is more insidious, and it's something that most people aren't discussing, but it is of great concern to me, and that's that there's a lot of indicia out there that it's not just that the campaign was actually using Cambridge's services, but that they actually replicated the dataset as a part of their larger Project Alamo. In particular, Brad Parscale,who is now the campaign manager but then was the digital director, talked about the fact that they were linking and combining three databases, what the Trump campaign had already had prior to their contract with Cambridge Analytica when Cambridge came on board in August, and then lastly the RNC's data. So that's what I'm really concerned about. 

Previously:

Tell Facebook: Stop Enabling Cambridge Analytica, The Trump Campaign, and Other Cheaters

Facebook failed to protect consumers from Cambridge Analytica. Only systemic changes can prevent that from happening again.

Right-wing media downplay Cambridge Analytica stealing personal data to help the Trump campaign

On All In, Angelo Carusone points out the Trump campaign used Cambridge Analytica's Facebook data to aid voter suppression effort