Yes, I know it's from last Friday but it's still interesting and relevant:
Hour by hour today, however, Blair has calmly and reasonably swatted all these accusations aside. He has done it not by spin or evasion but by setting out what I at any rate remember very clearly were the arguments that were made at the time but which have been all but obscured in public debate by the rewriting of the history of the conflict that has occurred, along with conclusions at which any reasonable person would have arrived at the time from the available information.
Thus the issue was not that Iraq was thought to have been involved in 9/11 – no-one had ever suggested this – but that 9/11 recalibrated as intolerable the risk posed by rogue states which were seeking access to WMD. This meant that Iraq, Iran, Libya and North Korea all had to be stopped; Iraq was first because it was in breach of UN resolutions to disarm and because Saddam had actually used the stuff on his own people.