Glenn Greenwald Defies NSA To Deny Snowden's Claims Under Oath

Will testify via video link before Congress on Wednesday

On ABC's Sunday morning news program, This Week, George Stephanopolous led with the Anthony Weiner scandal -- after all, whatever happens to be going on in New York City and sex are always the most vital topics in the U.S. A bit later, however, he got to the next most important story: the possibility that low-level NSA analysts can access anyone's calls, emails, and Web history.

Critics of Edward Snowden, the NSA leaker, have long insisted that he has "greatly exaggerated the amount of information available to people like him." The most radical claim in Snowden's video was perhaps that "I, sitting at my desk… had the authorities to wiretap anyone from you or your accountant to a federal judge to even the president if I had a personal email."