Barack Obama: "You can't have 100% security and also then have 100% privacy and zero inconvenience"
President Barack Obama has defended newly revealed US government phone and internet surveillance programmes, saying they are closely overseen by Congress and the courts.
Mr Obama said his administration had struck "the right balance" between security and privacy.
He also stressed US internet communications of US citizens and residents were not targeted.
And he tried to reassure the US "nobody is listening to your phone calls".
Mr Obama was commenting on revelations this week in the Guardian and Washington Post newspapers that the US National Security Agency (NSA) was collecting or tapping into vast amounts of telephone and internet communications data.
'Healthy scepticism'The news accounts - subsequently confirmed by officials - roiled Washington DC, with privacy advocates criticising the surveillance as an unlawful intrusion and many in Congress defending the programmes as appropriate counter-terrorism tools.
On Wednesday night, the UK's Guardian newspaper reported a secret court had ordered phone company Verizon to hand over to the NSA millions of records on telephone call "metadata".
That report was followed by revelations in both the Washington Post and Guardian that the NSA tapped directly into the servers of nine internet firms including Facebook, Google, Microsoft and Yahoo to track online communication in a programme known as Prism.
In California on Friday, Mr Obama noted both NSA programmes had been authorised repeatedly by Congress and were subject to continual oversight by congressional intelligence committees and by secret intelligence courts.
The president said he had come into office with a "healthy scepticism" of both programmes, but after evaluating them and establishing further safeguards, he decided "it was worth it".
"You can't have 100% security, and also then have 100% privacy and zero inconvenience," Mr Obama said.
Acknowledging "some trade-offs involved", he said, "We're going to have to make some choices."
Senior US Senator Dianne Feinstein confirmed on Thursday that the Verizon phone records order published by the Guardian was a three-month extension of an ongoing request to Verizon. Intelligence analysts say there are likely similar orders for other major communications firms.
The data requested includes telephone numbers, calling card numbers, the serial numbers of phones used and the time and duration of calls. It does not include the content of a call or the callers' addresses or financial information.
'Assault on Constitution'Prism was reportedly developed in 2007 out of a programme of domestic surveillance without warrants that was set up by President George W Bush after the 9/11 attacks.
Prism reportedly does not collect user data, but is able to pull out material that matches a set of search terms.
James Clapper, director of US national intelligence, said in a statement on Thursday the internet communications surveillance programme was "designed to facilitate the acquisition of foreign intelligence information concerning non-US persons located outside the United States".
"It cannot be used to intentionally target any US citizen, any other US person, or anyone located within the United States," he added.
But while US citizens were not intended to be the targets of surveillance, the Washington Post says large quantities of content from Americans are nevertheless screened in order to track or learn more about the target.
The Prism programme has become a major contributor to the president's daily intelligence briefing and accounts for almost one in seven intelligence reports, it adds.
Mr Clapper said the programme, under Section 702 of the Foreign Intelligence Surveillance Act, was recently reauthorised by Congress after hearings and debate.
In Congress, reaction to the revelations was split.
"As a result of the disclosures that came to light today, now we're going to have a real debate in the Congress and the country and that's long overdue.""When law-abiding Americans make phone calls, who they call, when they call and where they call from is private information," said Democratic Senator Ron Wyden.
Republican Senator Rand Paul called the programmes "an astounding assault on the Constitution''.
But his colleagues Republican Senator Lindsay Graham and Democratic Senator Dianne Feinstein both defended the phone records practice on Thursday.
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