One of the standard ways in Washington to influence administrative processes is via Congressional Oversight Hearings. Mind you, Congress is supposed to exercise reasonable oversight over the Administration, so this is a feature rather than a bug. But it also means that professional tea-leaf readers focus on these hearings to see what witnesses get called, who says what, and how vigorously they say it. Often, triangulating backwards, it gives insight into what industry is pressing as the most critical points — with Members then digging in to the issues (or, if one is cynical, doing the bidding of their corporate masters).
The hearing only had audio webcast going, so it was often difficult for me to tell who was saying what. But by and large, it seemed that Members were primarily in listening mode rather than heavily pressing for this or that particular outcome.