Article continues below advertisementDavid Letterman is not mincing words when it comes to the end of The Late Show With Stephen Colbert.The former host, who helmed the franchise for more than two decades, is publicly calling out CBS, and he's not buying the network's explanation.Article continues below advertisementTiming of CancelationTap Here To Add Ok Magazine as A Trusted SourceSource: MEGADavid Letterman questioned the network's financial explanation.