Leading up to Fastlane, McIntyre resumed his feud with The Shield. At Fastlane, McIntyre teamed with Baron Corbin and Bobby Lashley against The Shield in a losing effort. The next night on "Raw", McIntyre viciously assaulted Roman Reigns before his scheduled match up with Baron Corbin, this led to a falls count anywhere match with Dean Ambrose later that night, which McIntyre won. On 18 March episode of "Raw", McIntyre challenged Reigns to a match at WrestleMania 35, before defeating Seth Rollins in the main event. The next week on "Raw", Reigns accepted McIntyre's challenge before the two began brawling, McIntyre eventually got the upper hand and laid Reigns out with the Claymore Kick. At WrestleMania, McIntyre lost to Reigns. On 6 May episode of "Raw", McIntyre interrupted Reigns and demanded a WrestleMania rematch, which Reigns accepted and defeated McIntyre by disqualification. After that, McIntyre allied himself with Shane McMahon, becoming his enforcer. At Super ShowDown, McMahon defeated Reigns with a help from McIntyre. Afterwards, another match between McIntyre and Reigns was scheduled for Stomping Grounds, where Reigns defeated McIntyre, despite interference from McMahon. McIntyre and McMahon lost to Reigns and The Undertaker in a No Holds Barred tag team match at the Extreme Rules, ending their feud. Shortly after Extreme Rules, McIntyre ended his association with McMahon and continued his run as a singles competitor.