One would assume that if the people of their state want to leave then the congressmen and senators would not have a problem voting themselves out of a job. If they don't then they won't have a job after the next election anyway.
My dad used to support secession because the Constitution was a contract that was freely entered into. I argued that ALL contracts are freely entered into, but they are still binding until a remedy is exercised within that contract.
But with the exception of the original 13, states didn't enter freely into anything. They were allowed in, and only after a majority of the existing states said OK.
The “remedy” within the “contract” of the U.S. Constitution would be a vote by Congress passed by the President (or overriding of his veto).
I would argue that since the President plays no part in admitting a state then he should play no part in allowing them to leave.
bttt