The Pennsylvania Supreme Court on Monday ruled that the state’s congressional map went so far to benefit Republicans that it violated the state constitution.

The court, where Democrats have a 5-2 majority, blocked the use of the map in the 2018 midterm elections and ordered state lawmakers to begin to draw a new map.

The Pennsylvania congressional map has been notorious since its first use, in 2012, when Republicans won (and have subsequently held) 13 of the state’s 18 House seats despite losing a majority of the popular vote. Republican legislative leaders made no bones about their skill in screwing over Democrats. That didn’t much matter until now, when the Pennsylvania Supremes have ruled that extreme partisan gerrymandering violated both equal protection and “free expression” provisions of the state Constitution.

Because the decision was made on the basis of the state, not the U.S., Constitution, SCOTUS is very unlikely to intervene to save the bacon of Pennsylvania Republicans. If there is any federal recourse against the decision, it could involve the remedy the Pennsylvania court imposed. The judges gave state lawmakers only until February 9 to draw up a new map, with the governor having only until February 15 to submit it to the court, which will draw its own map if the state fails to make its deadline. The speedy timetable is intended to make it possible for the state to hold congressional primaries in May as is currently scheduled. It also reflects the fact that with today’s redistricting software, it really doesn’t take that long to redraw maps. But that’s still a tight window, and with a Republican legislature and a Democratic governor, an agreement could be difficult to reach.

Any map that complies with the ruling will likely cost the GOP one or more House seats at a time when they are already in danger of losing control of the chamber