AUDIE CORNISH, HOST:
While President Obama is acknowledging that the government is tapping into records from major Internet companies, most of those companies have issued broadly worded denials. That includes Apple, Google, Microsoft, Facebook and Yahoo.
NPR's Steve Henn joins us now to explain how these companies can deny taking part in a program that both the president and the intelligence community say exists. And, Steve, first, what do these firms say exactly when they are asked about PRISM?