Only this time the US inteligence agencies, aren't quite as keen to be left holding the bag when it all blows up in peoples faces.  In the run up to the Iraq war we saw lower level members of the US Intelegence organisation who didn't appear to agree with the  policy, most noticeably in the Plame/Wilson affair. The administration is reported to have "The feeling of the medieval church, including the Inquisition" about it, there isn't a sense of disagreement and discussion, more a sense of Good and Evil, and if you disagree you're evil  (taken from the following BBC documentary about 4 and a half minutes in if you want the full quote)

from the Asia times version of the same story we see that the bloodletting in trying to force the policy through, seemingly by Cheneys faction in the administration goes a lot higher

Asia Times Online :: Middle East News, Iraq, Iran current affairs

Cheney's desire for a "clean" NIE that could be used to support his aggressive policy toward Iran was apparently a major factor in the replacement of John Negroponte as director of national intelligence in early 2007. Negroponte had angered neo-conservatives in the administration by telling the press in April 2006 that the intelligence community believed that it would still be "a number of years off" before Iran would be "likely to have enough fissile material to assemble into or to put into a nuclear weapon, perhaps into the next decade".

Neo-conservatives immediately attacked Negroponte for the statement, which merely reflected the existing NIE on Iran issued in spring 2005. Robert G Joseph, the under secretary of state for arms control and an ally of Cheney, contradicted Negroponte the following day. He suggested that Iran's nuclear program was nearing the "point of no return" - an Israeli concept referring to the mastery of industrial-scale uranium enrichment.

Now this time there are two routes closed off to them, Forged documents are going to be looked at very carefully, so would be too much of a risk, and after the poor dosier produced by Blair, in any sane world, data from other government would be gone through with a fine tooth comb by the media, so this is probably too much of a risk too.

So what will the next move be?