David Letterman says Trump is a "psychotic soulless bastard".
He only came to this conclusion after Trump ran as a Republican and won, and didn't notice these traits during the 30+ previous times Trump appeared on his show.
Amazing coincidence!
https://summit.news/2019/06/12/after-appearing-on-his-show-30-times-now-letterman-says-trump-is-a-psychotic-soulless-bastard/