yet you collaborated with "the new york times" to help produce a number of stories of late that not only revealed what was happening with the nsa but with also its british counterpart, the gshq. why embark on that collaboration? >> there came a point we thought this would be a difficult story to report from london alone. so there were two reasons. one was that it was good to have a separate set of eyes on these documents and the reporters and "the new york times" brought expertise and depth to our own reporting. the other was that it was becoming impossible to report from london. there are a different set of media laws in london. there is a concept of prior restraint, ie the government can interfere to try and stop you for from publishing which just simply doesn't exist in the u.s. there came a point where it made