The Obama administration says the collection of phone records from millions of Verizon phone customers has been indispensable in the war on terror, fighting back against critics who contend it goes too far.

The Guardian's Glenn Greenwald on Wednesday evening broke the news that the administration has secured a secret order granting it access to all records of phone calls made on the Verizon network, which could be the broadest surveillance order ever reported. The White House, though, says it's necessary and prevents acts of terror.

"Information of the sort described in the Guardian article has been a critical tool in protecting the nation from terrorist threats to the United States, as it allows counterterrorism personnel to discover whether known or suspected terrorists have been in contact with other persons who may be engaged in terrorist activities, particularly people located inside the United States," said a senior administration official, granted anonymity to discuss the matter before an official response is issued.