He was interim Minister of Oil in Iraq in April–May 2005 and December 2005 – January 2006 and Deputy Prime Minister from May 2005 to May 2006. Chalabi failed to win a seat in parliament in the December 2005 elections, and when the new Iraqi cabinet was announced in May 2006, he was not given a post. Once dubbed the "George Washington of Iraq" by American supporters, he later fell out of favor and came under investigation by several U.S. government sources.