Prados is certainly not saying that U.S. intelligence shouldn't produce estimates until tasked by Congress to do so. Your assertion is absurd.
Second, that's not really the central issue of this paper. Instead, Prados finds that the facts reported in the summer 2002 CIA White Paper differed little from those in the October NIE. In both documents, the White House had pressured CIA to incorporate elements being stovepiped from Iraqi exile groups to OSP-OVP, and pressured analysts to self-censor data that contradicted those sources favored by the neocons.
Here's Prados' central point, as I read it:
There were several avenues by which the Bush administration made its preferences clear. Vice President Richard Cheney questioned his CIA briefers aggressively, pressing them to the wall when he saw intelligence from other agencies that portrayed a more somber picture than that in CIA’s reporting. He sent briefers back for more information, including in instances when they checked with headquarters and returned with the same word. Cheney was especially acerbic on CIA’s rejection of claims that one of the 9/11 terrorists had met with Iraqi intelligence officers in Prague. On a number of occasions, Cheney sent his chief of staff, I. Lewis Libby, to CIA headquarters to follow up on his concerns. Mr. Cheney went there himself, not just once but on almost a dozen occasions. The practice encouraged the CIA to censor itself, driven, as Pillar put it, by “the desire to avoid the unpleasantness of putting unwelcome assessments on the desks of policymakers.” (Note 6)
A second avenue to influence U.S. intelligence lay through Donald Rumsfeld’s Pentagon. There, William Luti’s Near East and South Asia unit of the Office of the Undersecretary of Defense for Policy (OUSDP) was in close touch with the Vice President’s office. Papers circulated back and forth, and both offices utilized claims from Iraqi exiles—claims that Saddam trained terrorists or possessed various WMDs—to press the intelligence agencies for similar information. Under Paul Wolfowitz, the Deputy Secretary of Defense, and the undersecretary for policy, Douglas Feith, the Pentagon formed a special group to review reports on Saddam’s links to Al Qaeda. This unit, the Policy Counterterrorism Evaluation Group (PCTEG) has been represented by Feith as merely charged with assembling a briefing on terrorism, but its real function was to bring additional pressure to bear on the CIA.
Not all the manipulation was visible. Behind the scenes at the State Department, Undersecretary of State John R. Bolton, also closely allied with the Office of the Vice President, pressured both the State Department and the CIA to fire individuals who refused to clear text in his speeches leveling the most extreme charges against other countries. Although Bolton’s actions did not concern Iraq directly, they came to a high point during the summer of 2002—the exact moment when Iraq intelligence issues were on the front burner—and they aimed at offices which played a central role in producing Iraq intelligence. These included the Bureau of Intelligence and Research at State plus the National Intelligence Council (NIC) and the Weapons Intelligence, Proliferation and Arms Control (WINPAC) center at CIA. Analysts working on Iraq intelligence could not be blamed for concluding that their own careers might be in jeopardy if they supplied answers other than what the Bush administration wanted to hear.
Under the circumstances, it is difficult to avoid the impression that the CIA and other intelligence agencies defended themselves against the dangers of attack from the Bush administration through a process of self-censorship. That is the very essence of politicization in intelligence. And the degree to which public statements on Iraq by Cheney, Bush, and others were “substantiated” by the existing intelligence must be viewed through that prism.
We shall offer only a few examples here. First is the case of the CIA white paper, “Iraq’s Weapons of Mass Destruction Programs.” That document is dated October 2002 and was issued on October 4. It has been represented as a distillation of the National Intelligence Estimate (NIE) on Iraq published two days earlier, with the most sensitive, secret information stripped out. Posted here today is the major portion of the text of the same paper in draft , as it existed in July 2002. This document demonstrates that the white paper existed long before the NIE was even requested by Congress. In fact the illustrations in the July version are the same as those in the final report. A close comparison of the text shows, further, that much of the argumentation is identical, and that the differences between the two are strictly in the nature of separating text to insert more charges or to sharpen them. The entire product has the character of rhetoric. Little of the text shows the kind of approach characteristic of intelligence analysis. The fact that this document was in preparation at the CIA in July indicates that the Bush administration was actively engaged in a process of building support for war months ahead of the time it has previously been understood to have done so. In fact evidence exists that the CIA white paper was commissioned as early as May 2002. (Note 7)