During an appearance on The Roommates Show, Triple H said that McMahon had requested him to wrestle at WrestleMania 38 in Dallas, TX, but that he declined due to his health issues and concerns.
The Undertaker's WrestleMania winning streak was already over at that point, having lost to Brock Lesnar at WrestleMania 30. Still, Reigns beating Undertaker in the main event of a WrestleMania ...