The volume of information harvested from telecommunication data and voice networks, without court-approved warrants, is much larger than the White House has acknowledged, the officials said.It was collected by tapping directly into some of the American telecommunication system's main arteries, they said.
As part of the program approved by President Bush for domestic surveillance without warrants, the NSA has gained the cooperation of American telecommunications companies to obtain backdoor access to streams of domestic and international communications, the officials said.