a lot of different techniques. the goal is to defeat the add adversary's action. >> did anything like that happen in terms of manafort? >> i cannot answer that, i could but i cannot. >> it is becoming the story of my life. when he says he cannot answer that. in some situation or someone suspected in working with the foreign power, the fbi has a number of different techniques to defeat the adversary nation actions. what were those when he became chairman of the trump campaign and the fbi knew what they knew about him. as of yesterday, we know from justice department prosecutor speaking in open court that manafort was being investigated for being possibly being a back channel between the trump c campaign and the russian government. what did the fbi do when