bring Flynn down and therefore to avoid being in defensive position once Flynn, as NSA, would certainly find out the surveillance they did on him/Trump campaign. This surveillance on him is not the one by FBI under DOJ which is subject to unmasking rule. That's why Sally Yates was surprised to learn on 1/5/2017 meeting that Obama already knew the Flynn's call contents, even herself didn't know then. It's likely the surveillance is conducted by Brennan's CIA. This is why a few days ago Brennan said he is willing to talk to Durham. He sensed he is the key and Durham is targeting him in investigation now.
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