The only way he should have agreed to this was with a couple of conditions. One, he gets to see the final edited cut 48 hours prior to airtime. Two, he gets access to all unedited raw video and audio. Three, he gets equal time to add his own rebuttal at the end using any footage or new footage. You know cnn, or any msm group with an agenda, would never go for it... Because they would either have to be fair and honest, our come off looking like the agenda driven manipulative jerks they are.
And/or four: get the agreement to air, unedited, in writing. (Then you have a much better legal case if they do try something.)