Trump should accept Perry’s endorsement, but be “two-faced” in dealing with him. Trump knows who is enemies are...and now he will be getting inside info when they try to covertly sabotage his plans as president. I wouldn’t trust the RINO establishment of my life depended on it.
Perry may have some GOPe connections, but he was never in D.C., and never made many (public) associations with anyone in that town. To tie him directly to them might be a stretch.