Politico reports that the federal agencies didn’t have much to say and only two Senators showed up.  However, Senator Cruz provides a defense of the First Amendment despite his personal experience. 

Cruz — the only other senator at the hearing — repeatedly raised questions of possible First Amendment violations.

“In my view, whenever congress acts in the area of political speech,
the touchstone of everything we do should be the First Amendment of the
Constitution,” he said.

“I would point out that in saying this I’m not unfamiliar with the
downsides,” he added. “In Texas I just came off of a campaign, where I
was outspent 3 to 1, and let me just say those who chose to put
resources into launching attacks against me had a First Amendment right
to do so. And God bless them for speaking out and being involved in
politics.”