TERRY GROSS: James Risen [is] an investigative reporter for The New York Times. He, along with Eric Lichtbau, broke the story about warrantless wiretapping. Now Risen is facing a prison sentence for refusing to reveal his source or sources for that story. [Risen] has a new book called Pay Any Price: Greed, Power And Endless War," which is a series of investigations into who's making money on the War on Terror and what are some of the secret operations within it. You recently wrote an article in The New York Times with Laura Poitras who broke the Edward Snowden story along with Glenn Greenwald. And you reported on how American intelligence is trying to harvest facial imagery with the intention of - what's it for? RISEN: Facial recognition ... in a way that no [one] really understood before has become a central focus of the NSA today. They can link that up with a signals intelligence, which is the communications that they intercept [and] basically find where you are, what you're doing, who you're seeing and virtually anything about you in real time. GROSS: So ... your big story turned out kind of differently than the celebrations facing Woodward and Bernstein. RISEN: I think the times have changed. We had this period in journalism for about 30 years where there was the government and the press. The government ... wouldn't go after whistleblowers or reporters very aggressively. It's only after the - after 9/11 and after the plane case, which you may remember where Judy Miller was sent to jail. I think the post-9/11 age, the government has decided to become much more aggressive against reporters and whistleblowers.