Tonight, Glenn Greenwald tells the Associated Press that Edward Snowden has “blueprints” that detail exactly “how the NSA is built.”

RIO DE JANEIRO (AP) — Edward Snowden has very sensitive “blueprints” detailing how the National Security Agency operates that would allow someone who read them to evade or even duplicate NSA surveillance, a journalist close to the intelligence leaker said Sunday.

Glenn Greenwald, a columnist with The Guardian newspaper who closely communicates with Snowden and first reported on his intelligence leaks, told The Associated Press that the former NSA systems analyst has “literally thousands of documents” that constitute “basically the instruction manual for how the NSA is built.”

“In order to take documents with him that proved that what he was saying was true he had to take ones that included very sensitive, detailed blueprints of how the NSA does what they do,” Greenwald said in the interview in Brazil, where he lives. He said the interview took place about four hours after his last interaction with Snowden, with whom he said he’s in almost daily contact.