Candidates run for election on campaign promises, but once they're elected they renege on those promises, which happened with President [Barack] Obama on Guantánamo, the surveillance programs and investigating the crimes of the Bush administration. These were very serious campaign promises that were not fulfilled.

I believe that when [senator Ron] Wyden and [senator Mark] Udall asked about the scale of this, they [the NSA] said it did not have the tools to provide an answer. We do have the tools and I have maps showing where people have been scrutinised most. We collect more digital communications from America than we do from the Russians.

I know that fundamentally, changes to the fabric of the internet, and sort of our methods of communication, can enforce our rights.

The big tech companies understood that the government had not only damaged American principles, it had hurt their businesses.

In America, we collect more digital communications from America than we do from the Russians.

It's much more important for U.S. to be able to defend against foreign attacks than it is to be able to launch successful attacks against foreign adversaries.

We don't have a great clash of civilizations, a clash of ideologies, a clash of alternative models, where governments thought to themselves, if we go too far, if we sort of trample unreasonably on rights, we'll give birth to a political movement which will cost us our credibility, and will possibly cost us our offices, because people will vote for the other team, the other guys.