Russert's attending that meeting was reported at that time, immediately after Bush's tax cut was passed. Republicans didn't seem to care at that time. Russert dismissed it as nothing, though, he was the ONLY media person invited & attended.
The minutes of that meeting they got from DNC under subpeana. Russert & Andrea Mitchell will have to turn over lots of material or reason for not doing so, on April 14. Here, you get lots of good info.