The CIA was largely skeptical of Chalabi and the INC, but information allegedly from his group (most famously from a defector codenamed "Curveball") made its way into intelligence dossiers used by President George W. Bush and British Prime Minister Tony Blair to justify an invasion of Iraq. "Curveball", Rafid Ahmed Alwan al-Janabi, fed officials hundreds of pages of bogus "firsthand" descriptions of mobile biological weapons factories on wheels and rails. Secretary of State Colin Powell later used this information in a U.N. presentation trying to garner support for the war, despite warnings from German intelligence that "Curveball" was fabricating claims. Since then, the CIA has admitted that the defector made up the story, and Powell said in 2011 the information should not have been used in his presentation. A later congressionally appointed investigation (Robb-Silberman) concluded that Curveball had no relation whatsoever to the INC, and that press reports linking Curveball to the INC were erroneous.