IDK. I don't see much stomach for keeping these miscreants in this country. If they took their (Dem) cities (NY, LA, San Fran, Chicago, etc) and formed a nation of city-states, outside of OUR country - and taking their Dem voting block with them - I'd be all for it!
The Federal Government would insist on keeping their property, remember Fort Sumter? The most they would get would be Commonwealth Status. They would lose representation and voting status but that doesn’t make them Independent.