How radical Islamists spread their messages; Red News/Blue News: is the ISIS "threat to the homeland" overblown? Hollywood reacts to Joan Rivers' hospitalization.
Above, Brian Stelter talks with Glenn Greenwald in his first interview since The Guardian and The Washington Post received the Pulitzer Prize for public service. Greenwald was a member of the Guardian team that reported on NSA mass surveillance programs using documents leaked by Edward Snowden last year.
Watch the full interview on Sunday, April 20th at 11am ET.
Read Brian's article to learn more about the other recipients of the Pulitzer prize for public service here.