Ahead of Facebook CEO Mark Zuckerberg’s Capitol Hill testimony this week, a Republican senator is telling the social media giant: “We have a problem.”

“I don’t want to hurt Facebook. I don’t want to regulate them half to death. But we have a problem. Our promised digital utopia has minefields in it. Mr. Zuckerberg has not exhausted himself being forthcoming,” Sen. John Kennedy, R-La., said on CBS’s “Face the Nation.”