"What you're essentially doing is saying that journalism is not only a crime, but now it's actually terrorism," he said. "It's an extremely dangerous precedent. They clearly abused their own law."
As to how what happened will affect his own work, Greenwald said he's more committed than ever to expose governments' abuse of their powers.
"We are absolutely going to continue to publish and, if anything, this has emboldened me," he said.