Stewart began a comedic feud with WWE wrestler Seth Rollins in March 2015, and appeared on WWE Raw during a Daily Show-styled segment hosted by Rollins. On August 23, 2015, Stewart returned to host the WWE SummerSlam 2015 at the Barclays Center in Brooklyn, New York. He would later get involved in the main event between Rollins and John Cena, helping Rollins retain his WWE Championship, as well as winning Cena's WWE United States Championship. The next night on Raw, he explained his actions, saying he did it for Ric Flair (who was also present), which was to retain his world championship record. Cena then gave Stewart his finishing move, the Attitude Adjustment, to end the segment.Stewart returned at WWE SummerSlam 2016 on August 21, 2016 as a special guest. He also teamed with The New Day against The Club and helped them retain the WWE Tag Team Championship.