Nunes probably has the most to worry about than any other GOP politician due to him being an active member on Trump's election team and then his absolute treasonous behavior in 2017 and early 2018 (same in the senate for Burr). His time will come and I await Schiff grilling this bastard in their committee once the dominoes really start dropping.
I wish I could remember who it was, it may have been Eric Swalwell, but in an interview on MSNBC or CNN following the closed hearings, they said that the GOP members that were in there were far more behaved and not angling for Fox News soundbites so they were able to get a lot more done and things went by much more swiftly.
So the GOP is still involved, but their theatrics seem to be far more muted in closed sessions.