Jon Stewart has been embroiled in a feud with Seth Rollins, the top "heel" (bad guy) of the WWE, after Rollins insulted Stewart by saying that Rollins could be a better host of The Daily Show.  Stewart then responded directly to Rollins, which led to Rollins to appear live in-studio on Stewart's show to issue him a challenge.  The WWE has now reported that Jon Stewart will appear on Monday Night Raw tonight to face off with Seth Rollins!  http://www.wwe.com/shows/raw/2015-03-02/five-point-preview-27146168/page-3

Here are the relevant videos of the feud in chronological order, including Seth Rollins' appearance on the Daily Show and a lengthy response by Jon Stewart: