The Committee should also know that, to ensure the independence and integrity of these investigations, and the investigations of congressional committees, I have not spoken with nor reviewed the confidential transcripts of any of the Department of Justice employees interviewed by congressional staff. I state this because, as a result, I may be somewhat limited when it comes to providing you with all of the facts that you may desire. I hope you understand that, to me, it was absolutely essential that the investigative work proceeds in a manner free of any complications by my efforts to prepare for this testimony.

(see full statement here.)

It’s SO nice that he couches an excuse for forgetfulness within his concern for the integrity of congressional oversight.