Sir Paul Kennedy, the data interception watchdog, said it was "essential" for the law to be strengthened, although he believed the proposed new powers would be used sparingly.

BBC: Computer keyboard and mouse

Mr Campbell alleged that national security agencies were using several major US corporations to aid their interception of data capabilities.

BBC: US spy system under attack

Furthermore, the United States has yet to identify a non-radar technology capable of providing the necessary data to permit reliable interception of the B-2.

CENTERFORSECURITYPOLICY: Roundtable Discussion On The B-2 Bomber

The Electronic Communications Privacy Act (ECPA) strictly prohibits the interception of content and traffic data and limits access to stored communications (such as emails).

FORBES: The Sheep Stop Here: Another Church Committee or Full Review of Privacy Laws Needed?