Incoming NSA chief Admiral Michael Rogers has moved to downplay the significance of Edward Snowden's revelations about the spy agency.

Ex-CIA worker Snowden exposed the organisation's controversial PRISM programme, which involves the collection of phone and email data, before fleeing the US.

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However, Admiral Rogers insists that Snowden's whistleblowing has not damaged the NSA's anti-terrorism operations.

"I have seen [terrorist] groups not only talk about making changes, I have seen them make changes," he told the New York Times.

PA Images / Andrew Parsons/PA Archive

The White House, Washington DC

Admiral Rogers went on to say that tighter controls are in place to ensure that future leaks do not occur, and promised to offer more transparency about his organisation's practices by engaging in "public dialogue".

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NSA head Admiral Michael Rogers downplays Edward Snowden leaks