NYT's Eric Lichtblau:
...................
In one previously undisclosed episode, Deputy Attorney General Larry Thompson refused to sign off on any of the secret wiretapping requests that grew out of the program because of the secrecy and legal uncertainties surrounding it, the officials said. With the veil of secrecy around the program, Mr. Thompson was not given access to details of the N.S.A. operation, and he was so uncomfortable with the idea of approving this new breed of wiretap applications that he had a top adviser write a memorandum assessing the legal ramifications.
The adviser warned him not to sign the warrant applications because it was unclear where the wiretaps were coming from.Inside the Federal Bureau of Investigation, meanwhile, technicians stumbled onto the N.S.A.’s program accidentally within 12 hours of its inception, setting off what officials described as a brief firestorm of anxiety among senior officials.
Some who had not been told about the program were concerned that the agency was violating laws that required a court order for the singling out of Americans in wiretaps, and they immediately alerted higher-ups to what they had discovered. “What’s going on here? Is this legal?” one F.B.I. official asked after learning of the N.S.A. operation on American soil.more at:
http://www.nytimes.com/2008/03/30/washington/30nsa.html?_r=1&scp=1&sq=lichtblau&st=nyt&oref=slogin