A top secret National Security Agency program allows analysts to search with no prior authorization through vast databases containing emails, online chats and the browsing histories of millions of individuals, according to documents provided by whistleblower Edward Snowden. The NSA boasts in training materials that the program, called XKeyscore, is its widest-reaching" system for developing intelligence from the internet. The files shed light on one of Snowden's most controversial statements, made in his first video interview published by the Guardian on June 10. "I, sitting at my desk," said Snowden, could "wiretap anyone, from you or your accountant, to a federal judge or even the president, if I had a personal email". Training materials for XKeyscore detail how analysts can use it and other systems to mine enormous agency databases by filling in a simple on-screen form giving only a broad justification for the search. The request is not reviewed by a court or any NSA personnel before it is processed. One presentation claims the program covers "nearly everything a typical user does on the internet", including the content of emails, websites visited and searches, as well as their metadata. Analysts can also use XKeyscore and other NSA systems to obtain ongoing "real-time" interception of an individual's internet activity. XKeyscore provides the technological capability [to target] US persons for extensive electronic surveillance without a warrant provided that some identifying information, such as their email or IP address, is known to the analyst.