U.S. intelligence officials face bipartisan congressional pressure to explain their use of surveillance powers, following a rebuke from a federal judge and Fox News host Tucker Carlson’s high-profile dispute with the National Security Agency.

“Our institutions are only as good as the American public’s confidence in them,” Florida Sen. Marco Rubio wrote a top intelligence official, requesting an investigation of Carlson’s allegation the NSA violated his privacy. “The NSA publicly responded to Mr. Carlson’s allegations with a statement on Twitter that frankly only created more questions.”