I think that would constitute secession. Although I have often wondered if there could be away around it, perhaps a state could declare that they no longer recognize the current Federal Government’s right to authority due to numerous constitutional violations and refuse to recognize the Federal Government until new elections are called and investigations and prosecutions declared or a new constitutional convention.
Perhaps away to “kick the Federal Government out” without leaving the Union. It would be a hail Mary pass to be sure, and odds are would quickly be defeated. Just thinking out loud.
We don’t need a Constitutional Convention I think. We need the current one to be enforced.