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New leak reveals ‘widest-reaching’ NSA program that allegedly collects data — without warrant — on all online users’ email, online chats and browsing histories in real time

The National Security Agency can allegedly snoop through all the Worldwide Web, and monitor – without a search warrant – anyone’s emails, online chats and browsing histories.

The top-secret NSA program, called XKeyscore, is the “widest -reaching” system ever created to troll the Internet, according to documents Edward Snowden shared with The Guardian newspaper in London.

The NSA confirmed XKeyscore’s existence but said it was being used only to target “legitimate” foreign sources – and not Americans, who have Constitutional protection against warrant-less searches.

“NSA’s activities are focused and specifically deployed against – and only against – legitimate foreign intelligence targets in response to requirements that our leaders need for information necessary to protect our nation and its interests,” according to an NSA statement.

PHOTOS: NSA PROGRAM COLLECTS ‘ NEARLY EVERYTHING INTERNET USER DOES’: REPORT

“XKeyscore is used as a part of NSA’s lawful foreign signals intelligence collection system.”

The paper claims these documents back up Snowden’s boasts that, as an NSA contractor, he had the ability to read anyone’s email – including President Obama’s.

“I, sitting at my desk, [could] wiretap anyone, from you or your accountant, to a federal judge or even the president, if I had a personal email,” Snowden told the paper in June.

Snowden’s been on the run ever since spilled his guts about America’s spying apparatus.

Training material Snowden produced showed how an analyst could used XKeyscore by filling out a simple on-screen form, requiring a nominal justification for the warrantless search, according to The Guardian.

There didn’t appear to be need for an NSA supervisor’s OK to go on the high-tech fishing expedition.

An NSA analyst would only need to know an e-mail or ISP address to break into a target’s Web history, according to Snowden.

XKeyscore can mine data immediately, capturing an individual’s Internet activity in real time, the leaker claimed.

In 2012, the NSA collected and stored more than 41 billion records in one 30-day period, according to The Guardian.

The NSA insisted Americans have nothing to fear.

“Allegations of widespread, unchecked analyst access to NSA collection data are simply not true. Access to XKeyscore, as well as all of NSA’s analytic tools, is limited to only those personnel who require access for their assigned tasks,” according to the NSA.

“In addition, there are multiple technical, manual and supervisory checks and balances within the system to prevent deliberate misuse from occurring.”

The agency claims safeguards prevent any rogue analyst from misusing XKeyscore.

“Every search by an NSA analyst is fully audit-able, to ensure that they are proper and within the law,” the agency said.

“These types of programs allow us to collect the information that enables us to perform our missions successfully – to defend the nation and to protect US and allied troops abroad.”