"The stakes could not be higher."
Leading global technology firms have called for "wide-scale changes" to US government surveillance. Eight firms, Google, Apple, Facebook, Twitter, AOL, Microsoft, LinkedIn, and Yahoo, have formed an alliance called Reform Government Surveillance group.
Microsoft's executive vice president Brad Smith and Kent Walker who is senior vice president at Google spoke to the Today Programme on Radio 4. Why did Kent Walker think this was a moment of great importance?