At Foreign Policy, an exclusive interview with the intellectual firmament of the administration's morally radiant (non-) torture and domestic spying policies,
John Yoo. A quick excerpt:

It seems to me that any serious loss of privacy does not occur until a human intelligence or law enforcement officer reads or listens to a communication. In thinking about what qualifies as reasonable searches in order to prevent future terrorist attacks, we should ask whether the government’s need to have an individual officer look at a particular communication outweighs any loss of privacy at that point.