Before revision: The program's existence was revealed in June 2013 by whistleblower Edward Snowden in The Guardian newspaper .New NSA leaks show how US is bugging its European allies, The Guardian, 30 June 2013.
After revision: The program's existence was revealed in June 2013 by whistleblower Edward Snowden in The Guardian .New NSA leaks show how US is bugging its European allies, The Guardian, 30 June 2013.