The goal is not secession; although the Neo-Confederates of the American fascist movement knee-jerk rely on such language when justifying their authoritarian power grabs.
Secession is counterproductive. They want to control the entire nation. Whenever they're out of power at the federal level, they will undermine its authority to stop them.
But once they're in charge, by hook or by crook, federal law becomes supreme again under a dictator backed up by the captured courts and states.