On ABC’s ‘This Week,’ journalist Glenn Greenwald explained that Americans could expect him to reveal more secrets about the government surveillance programs. Greenwald wrote two bombshell stories last week in the Guardian newspaper – one about the National Security Agency obtaining phone records from Verizon customers and one about the agency’s PRISM program. “[S]hould we be expecting more revelations from you?” asked Stephanopoulos. “You should,” Greenwald answered shortly. Greenwald remained quiet about his sources, reminding Stephanopoulos about the importance of whistle-blowers.