Some officials familiar with it say they consider warrantless eavesdropping inside the United States to be unlawful and possibly unconstitutional, amounting to an improper search. One government official involved in the operation said he privately complained to a Congressional official about his doubts about the program's legality. But nothing came of his inquiry. "People just looked the other way because they didn't want to know what was going on," he said.
Not sure this is related to that, but sounds as if Rocka feller could be the Times contact.
http://www.epic.org/privacy/terrorism/fisa/rock_cheney_ltr.pdf
Has Cheney confirmed that he was given a copy of this letter? The letter seems very self serving.
Interesting that it was hand written, so the date can not be confirmed.
Also, I hope the White House pulls out all stops to identify this leaker.