Enlarge / Rep. Devin Nunes (R-Calif.) in 2018. (credit: Tom Williams/CQ Roll Call) A lot of people on Twitter have been criticizing and mocking Rep. Devin Nunes (R-Calif.), and he's not going to take it anymore. On Monday, he sued several of his online critics—as well as Twitter itself—for defamation, negligence, and conspiracy.