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.

The NSA has built an infrastructure that allows it to intercept almost everything. With this capability, the vast majority of human communications are automatically ingested without targeting. If I wanted to see your emails or your wife's phone, all I have to do is use intercepts. I can get your emails, passwords, phone records, credit cards.

The New York Times and The Guardian came out and said, "Hey, clemency for Snowden." But for me, the key - and I've said this from the beginning: it's not about me. I don't care if I get clemency. I don't care what happens to me.

I have been to the darkest corners of government, and what they fear is light.

In the United States, there hasn't been much legislative change on the surveillance issue, although there are some tepid proposals.

At the trial of Chelsea Manning, the government could point to no case of specific damage that had been caused by the massive revelation of classified information. The charges are a reaction to the government's embarrassment more than genuine concern about these activities, or they would substantiate what harms were done.

I considered bringing forward information about these surveillance programs prior to the election, but I held off because I believed that [Barack] Obama was genuine when he said he was going to change things. I wanted to give the democratic process time to work.