David Letterman is coming to Stephen Colbert's defense. The former Late Show host slammed CBS executives as "lying weasels," while questioning the network's decision to cancel Colbert's show ahead of its May 21 finale. Although CBS framed the cancelation as a "financial decision," Letterman wasn't convinced. Speaking with The New York Times, he called out Paramount Skydance CEO David Ellison and accused him of "willy-nilly spending" his billionaire father's money.