NSA has massive database of Americans' phone calls ?

The National Security Agency has been secretly collecting the phone call records of tens of millions of Americans, using data provided by AT&T, Verizon and BellSouth, people with direct knowledge of the arrangement told USA TODAY.

The NSA program reaches into homes and businesses across the nation by amassing information about the calls of ordinary Americans � most of whom aren't suspected of any crime. This program does not involve the NSA listening to or recording conversations. But the spy agency is using the data to analyze calling patterns in an effort to detect terrorist activity, sources said in separate interviews.

The NSA's domestic program, as described by sources, is far more expansive than what the White House has acknowledged. Last year, Bush said he had authorized the NSA to eavesdrop � without warrants � on international calls and international e-mails of people suspected of having links to terrorists when one party to the communication is in the USA. Warrants have also not been used in the NSA's efforts to create a national call database.

In defending the previously disclosed program, Bush insisted that the NSA was focused exclusively on international calls. "In other words," Bush explained, "one end of the communication must be outside the United States."

As a result, domestic call records � those of calls that originate and terminate within U.S. borders � were believed to be private.

Don Weber, a senior spokesman for the NSA, declined to discuss the agency's operations. "Given the nature of the work we do, it would be irresponsible to comment on actual or alleged operational issues; therefore, we have no information to provide," he said. "However, it is important to note that NSA takes its legal responsibilities seriously and operates within the law."

The White House would not discuss the domestic call-tracking program. "There is no domestic surveillance without court approval," said Dana Perino, deputy press secretary, referring to actual eavesdropping.

She added that all national intelligence activities undertaken by the federal government "are lawful, necessary and required for the pursuit of al-Qaeda and affiliated terrorists." All government-sponsored intelligence activities "are carefully reviewed and monitored," Perino said. She also noted that "all appropriate members of Congress have been briefed on the intelligence efforts of the United States."

The government is collecting "external" data on domestic phone calls but is not intercepting "internals," a term for the actual content of the communication, according to a U.S. intelligence official familiar with the program. This kind of data collection from phone companies is not uncommon; it's been done before, though never on this large a scale, the official said. The data are used for "social network analysis," the official said, meaning to study how terrorist networks contact each other and how they are tied together.