NSA performed warrantless searches on Americans' calls and emails -- Clapper

US intelligence chiefs have confirmed that the National Security Agency has used a "backdoor" in surveillance law to perform warrantless searches on Americans’ communications.

The NSA's collection programs are ostensibly targeted at foreigners, but in August the Guardian revealed a secret rule change allowing NSA analysts to search for Americans' details within the databases. Now, in a letter to Sen Ron Wyden (D-OR) of the Senate Intelligence Committee, the director of national intelligence, James Clapper, has confirmed for the first time this backdoor had been used in practice to search for data related to “US persons.”

“There have been queries, using US person identifiers, of communications lawfully acquired to obtain foreign intelligence targeting non-US persons reasonably believed to be located outside the United States,” Clapper wrote in the letter. “These queries were performed pursuant to minimization procedures approved by the FISA [Foreign Intelligence Surveillance Act] court and consistent with the statute and the fourth amendment.”

The legal authority to perform the searches, revealed in top-secret NSA documents provided to the Guardian by Edward Snowden, was denounced by Sen Wyden as a “backdoor search loophole.” Clapper did not disclose how many such searches had been performed by the NSA.