The senator leading one of the probes into Russian activities related to the 2016 election says the appointment of a special counsel is likely to restrict public access to information.

Sen. Lindsey Graham, the chairman of the Judiciary subcommittee looking into the Russian election interference efforts, has been among the senators seeking testimony from former FBI Director James B. Comey in the aftermath of his firing by President Donald Trump. But now Graham is not expecting to hear much.

“It seems any conversations between Comey and the president may be covered by the special counsel’s order, and we’ve got to be careful about interfering,” the South Carolina Republican said.

Graham said that lawmakers need to speak with the new special counsel, former FBI Director Robert S. Mueller III, about not impeding his investigation.

“He’s a good guy, a good pick,” Graham said of Mueller. “I respect the decision, but it’s going to really limit what Congress can do, and it’s going to really limit what the public will know about this.”