text:  Right. So the overall terms that people should be familiar with are substitution and withdrawal. Those are the legal terms that govern this. Substitution is what it sounds like. Someone else going in, being substituted for President Biden. Withdrawal is Biden voluntarily stepping down. Let me back up and say about four months ago, Jason Schaaf, that's former chairman of the Oversight Committee, who I work with very closely at the Heritage Oversight Project, and I sat down and said,