The Late Show with Stephen Colbert Season 4 John C. Reilly, Sen. Jeff Flake Season 4, episode 70 John C. Reilly, Sen. Jeff Flake December 20, 2018 45 min Stephen welcomes actor John C. Reilly and Senator Jeff Flake. Previous episode Steve Carell, KiKi Layne Next episode Laura Benanti, Jon Stewart, Jon Batiste & Stay Human