Google says that intelligence gathering techniques used by the US and other governments are putting web users' online security at risk.
The online giant's senior vice president Ken Walker said: "We have invested so much in encryption and the fight for transparency around government requests for information.
"That's undermined when you have wholesale collection of data done in secret without independent oversight by many governments around the world," Walker told the BBC Radio 4 Today programme.
More top news
Donald Trump has said American culture is being "ripped apart" by efforts to remove Confederate memorials from parts of the country.
It's a bright start for many this morning, with a mixture of sunshine and showers across the UK.
Teenage schoolchildren who use e-cigarettes dramatically increase their chances of graduating to tobacco, research has shown.