Maybe him making it 5 years is a statement that he plans to be in office for a second term, but you're right someone needs to be there to enforce the contract.

Maybe him making it 5 years is a statement that he plans to be in office for a second term, but you're right someone needs to be there to enforce the contract. I think a law would be ideal, but I have little hopes of that being passed (similar to Trumps plan to add term limits), the lobbyists don't like it and they control the purses and the purses control the congressmen/women.