3 ms·What rule was it again that allowed the US to declare war on Iraq in 2003?by mynewtb 9y agoWhat rule was it again that allowed the US to declare war on Iraq in 2003?alexro 9y agoThe rules are those that the US or "combined west" sets up.jfnixon 9y agoTechnically, it was the 2002 AUMF, passed by large, bipartisan majorities in Congress.