NSA leaker Edward Snowden is defending his disclosure of top-secret U.S. spying programs in an online chat Monday with The Guardian and attacking U.S. officials for calling him a traitor.

“The U.S. government is not going to be able to cover this up by jailing or murdering me,” he said. He added the government “immediately and predictably destroyed any possibility of a fair trial at home,” by labeling him a traitor, and indicated he would not return to the U.S. voluntarily.

Congressional leaders have called Snowden a traitor for revealing once-secret surveillance programs two weeks ago in the Guardian and The Washington Post. The National Security Agency programs collect records of millions of Americans’ telephone calls and Internet usage as a counterterror tool. The disclosures revealed the scope of the collections, which surprised many Americans and have sparked debate about how much privacy the government can take away in the name of national security.

“It would be foolish to volunteer yourself to” possible arrest and criminal charges “if you can do more good outside of prison than in it,” he said.

The Guardian announced its website was hosting an online chat with Snowden, in hiding in Hong Kong, with reporter Glenn Greenwald receiving and posting his questions. The Associated Press couldn’t independently verify that the man answering the questions was indeed Snowden.

Snowden was working as a contractor for NSA at the time he had access to the then-secret programs. He defended his actions and said he considered what to reveal and what not to, saying he did not reveal any U.S. operations against what he called legitimate military targets, but instead showed the NSA is hacking civilian infrastructure like universities and private businesses.

“These nakedly, aggressively criminal acts are wrong no matter the target. Not only that, when NSA makes a technical mistake during an exploitation operation, critical systems crash,” he said, though he gave no examples of what systems have crashed or in which countries.

“Congress hasn’t declared war on the countries — the majority of them are our allies — but without asking for public permission, NSA is running network operations against them that affect millions of innocent people,” he said. “And for what? So we can have secret access to a computer in a country we’re not even fighting?”

Snowden was referring to PRISM, one of the programs he disclosed. The program sweeps up Internet usage data from all over the world that goes through nine major U.S.-based Internet providers. The NSA can look at foreign usage without any warrants, and says the program doesn’t target Americans.

U.S. officials say the data-gathering programs are legal and operated under secret court supervision.

Snowden explained his claim that from his desk, he could “wiretap” any phone call or email — a claim top intelligence officials have denied. “If an NSA, FBI, CIA, DIA, etc. analyst has access to query raw SIGINT (signals intelligence) databases, they can enter and get results for anything they want,” he wrote in the answer posted on the Guardian site. “Phone number, email, user id, cell phone handset id (IMEI), and so on — it’s all the same.”

The NSA did not immediately respond to an email seeking comment. But Director of National Intelligence James Clapper has said that the kind of data that can be accessed and who can access it is severely limited.

Snowden said the restrictions on what could be seen by an individual analyst vary according to policy changes, which can happen “at any time,” and said that a technical “filter” on NSA data gathering meant to filter out U.S. communications is “weak,” such that U.S. communications often get ingested.

Snowden defended U.S. Army Private Bradley Manning for his disclosures of documents to Wikileaks, which he called a “legitimate journalistic outlet,” which “carefully redacted all of their releases in accordance with a judgment of public interest.” He said the Wikileaks release of unredacted material was “due to the failure of a partner journalist to control a passphrase,” which led to the charge against Manning that he dumped the documents, which Snowden called an attempt to smear Manning.

Manning is currently on trial at Fort Meade — the same Army base where the NSA is headquartered — on charges of aiding the enemy for releasing documents to Wikileaks.

Snowden defended his description of his salary as being $200,000 a year, calling that a “career high,” but saying he did take a pay cut to take the job at Booz Allen Hamilton, where he worked as a contractor at an NSA facility in Hawaii. When Booz Allen fired him, they said his salary was $122,000.

(AP)