David Miliband, the only one lucky enough to be an MP at the time, says he supported the war because of evidence of Saddam's famous "weapons", adding he would have opposed it "if we had known then what we know now". But the only reason people believed Saddam had those weapons was because Miliband's government was telling everyone he did. So, he's saying: "If I'd known I was lying it would have been different, but how could I possibly know I was making stuff up? You can't blame me for fooling myself, as I'm very persuasive."
David Miliband is also accused of being complicit in handing suspects over to be tortured, so maybe he'll try a similar defence, saying: "If I'd known at the time that torture could include pain I would never have approved of it. But someone told me electrodes were more tingly than unpleasant, like one of those strange chairs that massages your back. Still, you live and learn."

(Mark Steel)