The top Democrat on the House Intelligence Committee said FBI Director James Comey is not providing lawmakers trying to probe Russian interference in U.S. affairs enough information to do their job.

“In order for us to do our investigation in a fair and thorough way, we’re going to need the full cooperation of the FBI,” Rep. Adam Schiff, D-Calif., said Thursday. “At this point the director was not willing do that,” he said after Comey briefed committee members.