Journalist and The Intercept founder Glenn Greenwald went on a Twitter rampage Thursday, excoriating fellow reporters who didn’t denounce the arrest of Julian Assange.

Greenwald tweeted:

"If you're a US media star who has spent 2 years claiming to be so concerned about press freedoms over Trump's mean tweets about your friends, but don't raise your voice in protest over this grave attack on press freedom, take a hard look in the mirror."

He also blasted reporters who were silent after the Department of Justice announced its hacking accusation against Assange for allegedly helping Chelsea Manning break into a Department of Defense computer.

Greenwald asserted the DOJ is wrong — and it essentially was criminalizing journalism.

Greenwald tweeted:

"The DOJ says part of what Assange did to justify his prosecution – beyond allegedly helping Manning get the documents – is he encouraged Manning to get more docs for him to publish. "Journalists do this with sources constantly: It's the criminalization of journalism."

MSNBC justice and security analyst Matthew Miller, however, countered Greenwald's argument, leading the pair to debate about whether hacking is a "journalistic technique."

Greenwald famously reported on U.S. and British global surveillance programs based on documents provided by former National Security Agency contractor and whistleblower Edward Snowden.