If Russia hacked the #DNC, they should be condemned for it. But during the #Sony hack, the FBI presented evidence. washingtonpost.com/world/national…

Even if the attackers try to obfuscate origin, #XKEYSCORE makes following exfiltrated data easy. I did this personally against Chinese ops.

Evidence that could publicly attribute responsibility for the DNC hack certainly exists at #NSA, but DNI traditionally objects to sharing.

The aversion to sharing #NSA evidence is fear of revealing "sources and methods" of intel collection, but #XKEYSCORE is now publicly known.

Without a credible threat that USG can and will use #NSA capabilities to publicly attribute responsibility, such hacks will become common.

This is the only case in which mass surveillance has actually proven effective. Though I oppose in principle, it is a mistake to ignore.