this is the origin story of how he will never leave office because we are in the Warhammer 40k timeline

Biden has sat immobile, his body slowly crumbling, within the White House of Terra for over 10,000 standard years. Although once a living man, his shattered, decaying body can no longer support life, and it is kept intact only by the cybernetic mechanisms of the White House and a feeble mind itself sustained by the daily sacrifice of thousands of aromatic children.