NBC news anchor Brian Williams has scored the first American television interview with Edward Snowden.
Last year, the ex-National Security Agency contractor exposed the extent of secret U.S. government surveillance of Americans and foreigners.
The one-hour interview is scheduled to air at 10 p.m. on Wednesday, May 28.
Williams traveled this week to Moscow, where Snowden fled to escape prosecution for revealing classified U.S. documents. Snowden hasn't been able to leave Russia since U.S. officials charged him with espionage and revoked his passport.
President Obama and military officials remain firmly in support of mass, warrantless spying, citing security concerns. But civil libertarians, technology companies and others oppose it, noting that the system lacks transparency and sensible limitations.