The War on Iraq was justified on three grounds: (1) Saddam Hussein had nuclear weapons, (2) He was aiding and abetting Al Qaida, and (3) He was seeking nuclear materials from Nigeria to build his own version of WMDs. All three grounds were shown, over the years, to be false.
In this video you watch George Bush, Dick Cheney, Condoleeza Rice and Colin Powell fabricate their allegations and then, after they have been shown to have no basis, say they never said what TV tapes clearly show they said.
So if you wish to see that staging the war in Iraq, which was one of the goals of 9/11, had no legal basis, this is the video to watch.