A push by Texas Republicans to redraw congressional maps to secure five more GOP seats in the U.S. House has kicked off a no-holds-barred battle between blue and red states, each threatening to redraw their own House seats.

The maps achieve a five-seat swing largely by shaving slivers of Republican strongholds from ruby red districts and placing them inside three urban districts.

Democratic members of the Texas state legislature left the state Sunday to try to block Republicans from redrawing the congressional map.