1. Illegal acroding to the UN"I've indicated that it was not in conformity with the UN charter from our point of view, and from the charter point of view it was illegal" - UN Secretary General Kofi Annan to BBC
2. Illegal under US lawThe Congressional authorization for the use of force had two requirements in it, that the President prove Iraq was a direct threat to the United States, and that the President prove Iraq was linked to 9-11
3. Terrorism according to the FBITerrorism is the unlawful use of force or violence against persons or property to intimidate or coerce a government, the civilian population, or any segment thereof, in furtherance of political or social objectives. - US Federal Bureau of Investigation
4. Illegal according to the US judges at the 1946 Nuremburg Tribunal"To initiate a war of aggression, therefore, is not only an international crime; it is the supreme international crime differing only from other war crimes in that it contains within itself the accumulated evil of the whole."5. Illegal according to the UN charterThe U.N. Charter says: "All members shall refrain...from the threat or use of force against the territorial integrity or political independence of any state". It says force may only be used in self-defence or if approved by the Security Council.
6. Illegal according to Hans BlixHans Blix, the head of the UN weapons inspection team declared that the war in Iraq was illegal.
http://www.informationclearinghouse.info/article5813.htm7. Implicitly illegal according to the Intl Atomic Energy Ass.IAEA chief's statement on Iraq - Jan 27, 2003
To conclude, we have to date found no evidence that Iraq has revived its nuclear weapons program since its elimination of the program in 1990s. 8. Illegal acording to 43 Australian experts in international law and human rights legislation They issued a declaration that an invasion of Iraq would be an open breach of international law and a crime against humanity, even if it took place with the authorisation of the UN Security Council.
http://www.gooff.com/NM/templates/Breaking_News.asp?articleid=114&zoneid=29. Illegal according to the Russian foreign minister"Without corresponding resolutions of the U.N. Security Council, this occupation will be illegal," Russian Foreign Minister Igor Ivanov
...and so on