The Republican party had control of the Senate and House leadership. They weren't much interested in investigating the Administration or doing vigorous oversight.

[link|http://rawstory.com/news/2005/HowSenate_Intelligence_chairman_fixed_intelligence_and_diverted_blame_fromWhite_House__0811.html|Raw Story]:

Shortly after the 9/11 attacks, President George W. Bush issued an [link|http://thinkprogress.org/wp-images/upload/bushrestrictedintel.pdf|order] to the Central Intelligence Agency, Department of Defense, the Federal Bureau of Investigation, the State Department, and his cabinet members that severely curtailed intelligence oversight by restricting classified information to just eight members of Congress.

"The only Members of Congress whom you or your expressly designated officers may brief regarding classified or sensitive law enforcement information," he writes, "are the Speaker of the House, the House Minority Leader, the Senate Majority and Minority Leaders, and the Chairs and Ranking Members of the Intelligence Committees in the House and Senate."

The order is aimed at protecting "military security" and "sensitive law enforcement."

[...]

The Senate and House intelligence committees were created in the 1970s after a series of congressional investigations found that the CIA had acted like a "rogue elephant" carrying out illegal covert action abroad.

By the late 1990s, members of the committees and their staffs were seeing more than 2,200 CIA reports and receiving more than 1,200 substantive briefings from agency officials each year to assist them in their role of providing proper oversight.

But the little-reported 2001 Bush directive changed that, ensuring that only two members of each committee received full briefings on intelligence operations, and preventing committee staffs from carrying out meaningful research.

Tom Reynolds, spokesman for the ranking Democrat on the House Select Committee on Intelligence, Jane Harman (D-CA), downplayed the significance of the order, saying members continued to have access. He acknowledged, however, that the "gang of eight" had higher-level clearances.

The spokesman for the Senate Intelligence Committee deferred comment to the White House; the White House did not return requests for comment.

[...]

Whether Roberts actually saw the Niger forgeries during Hadley\ufffds briefings is unclear. What is clear is that by March of 2003, the Intelligence chairman was in a position to head off any serious investigation into concerns raised by Sen. Jay Rockefeller (D-WV), the committee's ranking Democrat and vice-chair.

Rockefeller has grave concerns about deceptive intelligence, so serious that he pens a formal letter to FBI director Robert Mueller.

Rockefeller urges Mueller to investigate the Niger forgeries as part of what he feared to be "\ufffda larger deception campaign aimed at manipulating public opinion and foreign policy regarding Iraq," writes the New Yorker's Seymour Hersh.

Roberts declines to sign the Rockefeller letter, seeing the involvement of the FBI as inappropriate. As a result, Rockefeller's letter falls on deaf ears.

On July 11, 2003, faced with public pressure to investigate the Niger forgeries, Roberts blames the CIA and defends the White House.

[...]


It's hard to have oversight when the information is so restricted to so few people, when the interests of the Party superscede the oversight functions, and when too many people don't ask probing questions.

I fear we aren't going to make much additional progress on this topic, so I'll let you have the last word.

Cheers,
Scott.