"It's not just a US problem. The UK has a huge dog in this fight," he said. "They (GCHQ) are worse than the US."
The information is the latest leak from Mr Snowden, who has been responsible for a string of disclosures about US intelligence operations.
More top news
Party rules state the new Tory leader will be announced on 9 September, but the way things are going it could all happen much sooner.
Contrary to Michael Gove's belief, people do need experts, now more than ever as we work out what leaving the EU actually means.
Cool and breezy for the time of year