The spy agency was collecting much of the data by eavesdropping on some Americans' international communications and conducting computer searches of foreign-related phone and Internet traffic. Some F.B.I. officials and prosecutors also thought the checks, which sometimes involved interviews by agents, were pointless intrusions on Americans' privacy.
Then FBI Director Robert Mueller questioned the legality of the program but ended up accepting the Justice Department's assurances.
In sum,
President Bush has characterized the eavesdropping program, which focused on the international communications of some Americans and others in the United States, as a "vital tool" against terrorism; Vice President Dick Cheney has said it has saved "thousands of lives."
But the results of the program look very different to some officials charged with tracking terrorism in the United States. More than a dozen current and former law enforcement and counterterrorism officials, including some in the small circle who knew of the secret eavesdropping program and how it played out at the F.B.I., said the torrent of tips led them to few potential terrorists inside the country they did not know of from other sources and diverted agents from counterterrorism work they viewed as more productive.
And what a surprise, Bush exaggerated:
But, along with several British counterterrorism officials, some of the officials questioned assertions by the Bush administration that the program was the key to uncovering a plot to detonate fertilizer bombs in London in 2004. The F.B.I. and other law enforcement officials also expressed doubts about the importance of the program's role in another case named by administration officials as a success in the fight against terrorism, an aborted scheme to topple the Brooklyn Bridge with a blow torch.
Some officials said that in both cases, they had already learned of the plans through prisoner interrogations or other means.
One more:
By the administration's account, the N.S.A. eavesdropping helped lead investigators to Iyman Faris, an Ohio truck driver and friend of Khalid Shaikh Mohammed, who is believed to be the mastermind of the Sept. 11 attacks. Mr. Faris spoke of toppling the Brooklyn Bridge by taking a torch to its suspension cables, but concluded that it would not work. He is now serving a 20-year sentence in a federal prison.
But as in the London fertilizer bomb case, some officials with direct knowledge of the Faris case dispute that the N.S.A. information played a significant role.
[graphic created exclusively for TalkLeft by CL.]