Twitter is fighting a Jan. 6 committee request for its employees’ internal communications — including Slack messages about moderating Tweets related to the Capitol attack, three sources familiar with the matter tell Rolling Stone.

The social media giant is asserting a First Amendment privilege to push back on the panel’s demand for communications about moderating tweets related to the Capitol insurrection.

Twitter’s pushback, the sources say, has caused consternation among the committee, whose members believe the internal communications would help them paint a fuller, more accurate portrait of how online MAGA extremism contributed to the day’s violence and mayhem. But the fact that the company is being asked for its internal communications at all raises tricky issues about the balance between free expression and the government’s authority to investigate an attempt to subvert democracy. And it shows just how wide Congressional investigators have been willing to cast their net in the run-up to their primetime hearings, which begin this week.