I think there's a tinge of nerves in his mannerisms. There's a reason why he's often bluffing it out in the media. He's a stakeholder in Jeremy's conviction - and quite a big one (due to his actions). He's trying to convince the audience that is the public, that there was and is a soundness to Jeremy's conviction - but his motivation for doing so is self-preservation. It's an attempt at justifying himself.