Against which would you verify when the goal of policy documents and bills is to create something new (and even the references to old things are unavailable, inaccurate, or even invented)?

Another thing is that the Congress (like any governmental body in any country) presumably has huge databases of digitalized documents that could be used to train a custom LLM better suited for these tasks.

That it meets an intent.

"Take 3 hours of floor arguments and committee testimony, and identify compromises."