Drugs. Lots of drugs.
LOL most def drugs... but can you imagine what kind of CIA debriefing and mind-control had to be performed on him due to information he may have inadvertently been exposed to during the 8 years of his presidency regarding the atrocities committed by “his” administration? Truth be told, “they” probably lobotomized him the second Big O was sworn in. They could never let a drinking and drugging aging frat boy run around loose with that kind of Intel.