Did U.S. attorneys disagree on whether to close Armstrong, U.S. Postal case?

The Wall Street Journal has alleged there was some debate within the US Attorney's Office as to whether the two-year investigation into allegations of fraud and doping that involved the U.S. Postal Service Team and Lance Armstrong should have been closed last week. Armstrong has denied ever taking performance enhancing and welcomed the decision to close the case. He may still face investigation from USADA.