Many of the DNC congress critters with access to these things have been rather loud about there being no legal justification for their being witheld. Nothing classified, nothing privledged. They spent the first couple of days on the confirmation hearings describing the content and saying that the protections they’ve been put under are a fiction to prevent the public from seeing them. Or prevent their use in the hearings.
So yeah they appear to be violating the rules. But they carefully built a public justification for doing it. And I’m willing to bet have prepared legal stuff to argue there was no rule breaking since the protections involved were clearly bullshit.
This is a lot more coordinated than I expected. I though the “why can’t we show the documents” was just weak foot stamping. Its looking more like a planned effort to force the documents out.