techniques as he can get away with. >> reporter: do you realize what you're saying? you're talking about warfare on the american citizenry. >> this is steve bannon and robert mercy using a foreign military contractor to use some of the same techniques that the militaries use to fight isis on the american electorate. that's what they wanted, and that's what they got. >> reporter: cambridge analytica is a subsidiary of the british sel group. for 25 years, the military contractor has worked with 60 countries including british and american governments, helping battle crime, drugs, terrorists. by changing the opinions of foreign populations. >> scl sales pitch was, look, we go into foreign countries and use tools, profiling to manipulate public opinion. ultimately that's what bannon wanted to do in the united states. he wanted to manipulate public opinion. >> reporter: so bannon created