Greenwald has become a household name as he's already published thousands of secret documents on behalf of NSA leaker Edward Snowden. The reporter is being even more combative after British authorities recently detained his Brazilian partner David Miranda for nine hours at Heathrow Airport.
Miranda said British agents held him in their custody as he was on his way back to Rio from Berlin, where he meet with subversive filmmaker Laura Poitras, citing an anti-terrorism law.
Greenwald is now vowing to release more classified information. While in Rio De Janeiro, he told TV Globo:
"I am going to write my stories a lot more aggressively than before. I am going to publish many more documents now. I have a lot of documents about the espionage system in England."
CNN's Senior Legal Analyst Jeffrey Toobin weighed in and called Greenwald's response "revenge journalism."
"That's not how we're supposed to act. We're supposed to be journalists because there's material that should be published, not because we're angry at people."
Watch this clip to see Toobin's full opinion on the story: