FILE – In this April 21, 2010 file photo released by CBS, host David Letterman is shown on the set of the “Late Show with David Letterman, in New York. A frequent poster on a jihadist website has threatened David Letterman, urging Muslim followers to “cut the tongue” of the late-night host because of a joke made by the comic on his late-night CBS show. The poster, who identified himself as Umar al-Basrawi, was reacting to something Letterman said after the U.S. military said on June 5 that a drone strike in Pakistan had killed al Qaida leader Ilyas Kashmiri. (AP Photo/CBS, Heather Wines) MANDATORY CREDIT; NO SALES; NO ARCHIVE; NORTH AMERICAN USE ONLY