John Oliver returned to his old stomping grounds with a surprise cameo on "The Daily Show" to discuss America's "monarchy era."

On Monday, perhaps the most successful alum of the Jon Stewart-era of "The Daily Show" is John Oliver, host of "Last Week Tonight," made a surprise return to the show. But he wasn't there just to bro-out with Jon Stewart.

It was a Daily Show reunion on Monday night former correspondent John Oliver joined host Jon Stewart on the show. The ex-colleagues got together, warning Americ