Edward Snowden's leaks could be just tip of iceberg (VIDEO)

The revelations of the G20 spying come as the scandal caused by Snowden's earlier disclosures - on the extent of US surveillance after its own and foreign citizens - is gaining momentum.

Dozens of lawsuits are being filed against the government's practices - while many lawmakers continue to defend the operation.

It has also emerged that the scope of the surveillance - and the help it received from corporations - may have been underestimated.

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