Former CIA Director David Petraeus on Thursday said his resignation had nothing to do with the attack on the U.S. Consulate in Benghazi, Libya, and denied disclosing any classified information.

Petraeus’s comments come a day before he is expected to testify to the House and Senate Intelligence committees at closed-door hearings. Those hearings are expected to focus on what Petraeus saw when he visited Benghazi.

“His assessment of what he found on the ground is absolutely crucial to put together with the other pieces of the puzzle people’s view of what happened during and after the event,” Sen. Richard Burr (R-N.C.) said Thursday as he exited a House Intelligence Committee hearing on Benghazi.