I’d say it’s the media and general public that want Facebook to curb “fake news”, more so than Washington.
https://www.wsj.com/articles/mark-zuckerberg-facebook-made-m...
Zuck is losing on purpose here by admitting they screwed up, so that he can pivot into a negotiating stance to determine what level of control government will get. This is not all decided yet, it is still in play but this hire suggests that some progress was made in the negotiation.
Washington has been shouting fake news from both sides for a while. Is worth noting that Trump just copied something already being said by others and mashed the definition.