The British host of “Last Week Tonight” said he wanted to be “the first to welcome America to its 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.

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