https://www.cnbc.com/2018/04/10/zuckerberg-says-facebook-is-working-with-special-counsel-mueller-in-probe.html

Facebook CEO Mark Zuckerberg testified to a joint hearing of the Senate Judiciary and Commerce committees Tuesday that Facebook is cooperating with Special Counsel Robert Mueller's investigation.

"I know we are working with them," Zuckerberg said during the hearing.