This is a public enquiry, I should point out, and not a criminal case. As such, there is no "prosecution" taking place. Other than in the court of public opinion, that is...
Witnesses for the prosecution: how Blair is suffering trial by Chilcot
I'll sum this up, for you: Blah's a fucking liar and the American administration of Shrub is a bunch of administrative fuckwits, with serious control issues, large guns and small penises.