Trump loves Andrew Jackson, Jackson disagreed, both are NATIONALISTS.
The President should be a nationalist, not to be concerned about state issues and to project power to the world. I am familiar with Jackson’s quote of his willingness to hang secessionists himself.
However, that doesn’t change a right of a state to leave. As I said, the Founding Fathers did not enumerate to the federal government the ability to prevent a state from leaving. So, therefore, it had a right to leave via the Tenth Amendment.
The only thing the Federal government can do is place conditions upon a state that regrets leaving and applies to join the union again. There, the federal government can place all the conditions it wants. That’s also a check against a schizophrenic state from joining, then leaving and joining again.