That's what senior U.S. intelligence and law enforcement officials tell us about the man whose leaks they call the worst in U.S. history. These officials say any momentum for these negotiations is gone; his lawyers have not even had conversations about such a deal for nearly a year with the U.S. attorney prosecuting the case. The officials say the chance that Snowden will be offered a plea deal in exchange for cooperation is now close to non-existent.

There are three main reasons. The U.S. intelligence community today believes it knows more about what Snowden took than it did in 2014. Back then, the intelligence assessments assumed that every piece of data Snowden's Web crawler programs scanned was also copied and downloaded to files he later took. U.S. intelligence officials tell us that a more accurate picture has emerged of what Snowden actually took, as opposed to what he just scanned.