One of the reporters honored with a Pulitzer Prize last week for his reports on National Security Agency surveillance on Sunday promised further revelations.

The Guardian's Glenn Greenwald told CNN'S "Reliable Sources" that there would be new surprises stemming from Edward Snowden's leaks in a book coming out in May.

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“There are stories that I felt from the beginning really needed the length of a book to be able to report and to do justice to, so there’s new documents, there’s new revelations in the book that I think will help inform the debate even further,” Greenwald said.

Greenwald said he felt honored when Rep. Peter King (R-N.Y.) denounced the Pulitzer board for giving its public service prize to The Guardian and The Washington Post for their Snowden stories.

King tweeted that the award was disgraceful.

“You know I look at Peter King’s condemnation as an enormous badge of honor,” Greenwald said, adding “if you want to be adversarial to those who wield power, you have to expect that those who wield power aren’t going to like what you’re doing very much, and not only doesn’t that bother me, I see that as a vindication that what I’m doing is the right thing.”

Greenwald said he felt safe coming back to the United States last week because he expected the Pulitzer announcement would make the Obama administration think twice about having him arrested for his stories.

“They wanted to create this climate where there was this serious possibility that those of us who were doing the reporting could be criminally prosecuted. And I think one of the reasons why I was willing to come back to the United States when I did is because I knew that the Polk Awards as well as the Pulitzers were this week and it would make it very difficult to follow through on those threats,” he said.