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Federal investigators looking into the leaks of both those programs to the press are zeroing in on the Senate, and are expected to continue to hold interviews of both Senators and their senior staff in the coming days. "This investigation is moving forward at a pretty fast clip," says the law enforcement source. "We're not looking at a two-year probe. We're talking about moving fast."

As yet, cooperation from the media outlets -- the Washington Post and the New York Times has been minimal, but investigators aren't sure they will need full cooperation to make the case. "The Hill may be all we need," says the source.

Focus of the investigation remains on the staffs of two Senators, Sen. Jay Rockefeller and Sen. Dick Durbin, as well as committee staff for the Senate Intelligence Committee and career intelligence staff detailed to U.S. Senate offices and committees. Last week, it was revealed that on February 17 Senator Rockefeller had sent a letter to the White House claiming that the Bush Administration had illegally leaked classified materials to Washington Post reporter Bob Woodward for a book project he was working on with cooperation from the Bush White House.