>Mueller had no idea what Flynn was doing.
Extending that thought -
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Mueller doesn't have the information on Strzok/McCabe 302 fraud (so he has to assume the 302s are true - ergo Flynn lied)
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Mueller doesn't have info on WHY Flynn was working against Gulen and had to lie on his FARA about Turkey.
My read is that Flynn was working to expose Gulen/Obama/Cabal attempt to overthrow Turkey. He couldn't exactly register as a lobbyist saying that.