Article continues below advertisementIn a notable display of support, David Letterman is backing Stephen Colbert after CBS announced the cancelation of The Late Show with Stephen Colbert.On Monday, July 21, the legendary host shared a compilation video on YouTube highlighting his own years as host of the iconic late-night program from 1993 to 2015. The caption drew a bold line, stating, "You can't spell CBS without BS."Article continues below advertisementSource: MegaDavid Letterman dropped a YouTube video highlighting his hosting run.