"The main one is that everyone was worried about some kind of follow-up attack (after 9/11). But for most of 2002 and into 2003, Cheney and Rumsfeld, especially, were also demanding proof of the links between al Qaida and Iraq that (former Iraqi exile leader Ahmed) Chalabi and others had told them were there."
There was constant pressure on the intelligence agencies and the interrogators to do whatever it took to get that information out of the detainees, especially the few high-value ones we had, and when people kept coming up empty, they were told by Cheney's and Rumsfeld's people to push harder," he continued.
Senior administration officials, however, "blew that off and kept insisting that we'd overlooked something, that the interrogators weren't pushing hard enough, that there had to be something more we could do to get that information," he said.