"Never, ever, ever trust a member of the Washington DC UniParty."
I worked in commercial banking for years, and whenever a loan officer announced that he or she was quitting to take a position with another bank, there was no nonsense about letting them hang around. They would formally give two weeks notice, and then be ushered out of the bank within 24 hours of announcing that they were resigning. The bank didn't want them around to crib information to take with them for future business development, so out they went. And no hard feelings; everyone knew that's how it worked.
I devoutly wish that, once a senator or congressman announced his retirement, a figurative (or even a literal) trapdoor would open up under his feet, so that he could be shot immediately out onto the pavement. He could even be permitted to hang on to as much loot as he could cradle in his arms. Just get rid of him.