North Carolina Republicans approved a new congressional map Friday that would cost the party at least two House seats and potentially roil the state’s delegation — but Democrats immediately objected, saying it’s still a GOP gerrymander.

Republicans represent 10 of the state’s 13 districts and would be very likely to lose two seats: those held by Republican Reps. George Holding and Mark Walker. Democrats, though, argue the new map doesn’t go far enough and quickly challenged it in state court.

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A Democratic challenge of the map could prompt the judges to appoint a special master to craft a new one. An obvious choice would be Nathaniel Persily, a Stanford University law professor who has overseen past court-mandated redraws in the state and is the author of a handful of congressional maps in use throughout the country.