Not a whole lot, according to John Bolton. Adam Serwer had some similar thoughts about Bolton’s Post op-ed.

Meanwhile, in something so ridiculously predictable it was destined never to have been part of the Iraq-invasion debate of 2002-3 — not that I predicted it, but it should have at least occurred to me — Saddam Hussein told his FBI interviewers that he was bluffing about WMDs in order to spook Iran. Imagine that Saddam was still in power. He wouldn’t have tolerated an Iranian nuclear weapon. Would anyone seriously believe that if the Iraqi Air Force bombed Iranian nuclear facilities, it would cause the Iranian people to conclude that they were misgoverned, and their hardline, nuke-seeking leaders brought them to the brink of destruction?

Update: Tom Ricks FTW.