The inclusion of congressional phone data in the FBI investigation raises thorny constitutional questions.
The data is also being used to map links between suspects, which include members of Congress, they also said. (Capitol Police are reportedly investigating whether lawmakers helped rioters gain access to the Capitol as several Democrats have alleged they did, though Republican officials deny this.)
The Justice Department has publicly said that its task force includes senior public corruption officials. That involvement “indicates a focus on public officials, i.e. Capitol Police and members of Congress,” the retired FBI official said.