Nick Harvey from aid organisation Doctors of the World, which was allegedly targeted by GCHQ, told ITV News: "We're completely shocked and surprised by these allegations of secret surveillance.
"Our doctors, nurses and midwives are by no stretch of the imagination a threat to national security so we have no idea why they would target an organisation like ourselves."
More top news
Mostly cloudy with rain elsewhere.
A man and woman have appeared in court charged in connection with the death of Olympic cyclist Chris Boardman's mother.
A Labour government would bring contracts signed under the Private Finance Initiative back into the public sector, John McDonnell has said.