Exactly!
Rush is saying, "If this stuff had been going on I'd know about it". He is saying, "I was there and I was paying attention and I don't remember Newt bashing Regan".
Further Rush is saying this is an obvious coordinated attack on Newt coming together to do the most damage to him.
I caught on that that was what he was doing in about 5 minutes of listening in hour number 2.