If the President wanted to get nasty in the debate, he could review the transcripts for the sessions Kerry missed, particularly the open ones. Then, when Kerry launches into some long-winded BS argument, the Pres can rebut it and point out that the Intelligence Committee had covered that at the meeting. Weren't you there Senator?
...and then hear the MSM shrieking "HATE SPEECH! HATE SPEECH! ..UNFAIR!,UNFAIR! He's using the truth."