"Benjamin B. Ferencz was one of the chief prosecutors for the United States at the military trials of German officials following World War II, and a former law professor. In an interview given on August 25, 2006, Ferencz stated that not only Saddam Hussein should be tried, but also George W. Bush because the Iraq War had been begun by the U.S. without permission by the UN Security Council. Benjamin B. Ferencz wrote the foreword for Michael Haas's book, George W. Bush, War Criminal?: The Bush Administration's Liability for 269 War Crimes. Ferencz elaborated as follows:- https://en.wikipedia.org/wiki/Legality_of_the_Iraq_War#War_of_aggression
See also: http://www.larouchepub.com/eiw/public/1997/eirv24n06-19970131/eirv24n06-19970131_015-waging_aggressive_war_is_a_nurem.pdf
And Libya? And Syria?