If he knew, then why the lies?
I don’t believe he lied.
Cohen is the one lying.
This is precisely why Mueller wants to interview Trump, so he can get him to disagree with some other players: Cohen, Gates? Then purgery becomes the impeachable crime they have been looking for for two years.
This is very sneaky, but reminds me of a motorcycle comp who once tole me that he could pull any biker over and find something wrong with the bike. Not what you like the law to be up to, but Mueller is up to this in spades.