premise: Stephen Colbert is on CBS as host of The Late Show.
hypothesis: Stephen Colbert . Colbert has hosted The Late Show with Stephen Colbert , a late-night television talk show on CBS , since September 8 , 2015 . Dr. Stephen T. Colbert D.F.A. is the fictionalized persona of political satirist Stephen Colbert , as portrayed on the Comedy Central series The Colbert Report and occasionally on The Late Show with Stephen Colbert on CBS . This came after the real Colbert announced he would not be using the character when he replaced David Letterman as the host of Late Show on CBS in 2015 .