There are known Rat leakers on Nunes committee (Schiff, Speier, e.g.). It’s probable that the documents contain information that the leakers are in legal jeopardy.
The leakers will also run back to their allies in the FBI and DOJ with information contained in the documents.
There are people on Nunes committee that cannot be trusted with classified information.
“There are people on Nunes committee that cannot be trusted with classified information.”
Then the FBI must convince the Speaker to back off.
Because the US Congress is entitled to these docs under every and all circumstances.