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This undated photo provided by Facebook shows the server room at the company's data center in Prineville, Ore. The revelations that the National Security Agency is perusing millions of U.S. customer phone records at Verizon and snooping on the digital communications stored by nine major Internet services illustrate how aggressively personal data is being collected and analyzed. (AP Photo/Facebook, Alan Brandt)

As a candidate for president in 2008, Barack Obama set a high bar for his administration, declaring that it would be the most open and transparent in history.

But Obama for years has been making decisions behind closed doors about the privacy of American citizens' telephone records and other data available through technology. At his news conference Friday in San Jose, he said he would welcome a public debate on the balance between privacy and security. So would we.

The precise details of the methods security agencies use to identify threats have to remain classified if they are to work, and they do appear to have worked. Until Boston, there had been no major terrorist attack. But to intelligently debate that delicate balance, Americans need a better understanding of the extent to which government is accessing data about them. Concern spans the political spectrum: The ACLU and the tea party are of like mind on this.

The president defends his programs, denying that intelligence agencies are listening to phone calls or probing citizens' conduct through data mining.

He stresses that all three branches of government oversee these programs; Congress has been briefed all along and the courts must approve specifics.

But some dispute the claim that Congress was briefed, and two senators have warned that Americans were out of the loop.

"We believe most Americans would be stunned to learn the details of how these secret court opinions have interpreted the anti-terrorism Patriot Act," Sens. Ron Wyden of Oregon and Mark Udall of Colorado wrote to Attorney General Eric Holder last year. "There now is a significant gap between what most Americans think the law allows and what the government secretly claims the law allows."

Civil rights organizations for years have decried the lack of accountability for U.S. intelligence agencies that historically have been prone to excess. It's reassuring to hear the president say that nobody's listening to actual phone calls without a warrant, but most Americans didn't realize until last week that agencies were accessing their phone records.

"If people can't trust not only the executive branch, but also don't trust Congress and don't trust federal judges to make sure they were abiding by the Constitution, due process and the rule of law, then we're going to have some problems here," Obama said Friday.

Trust is at a premium these days, Mr. President, and Americans need to better understand what's happening to determine if the balance of safety and civil liberties has been skewed.