The order further upends a North Carolina political landscape that was, until this autumn, carefully crafted to maintain Republican dominance in all but the most unlikely Democratic landslides. The same three-judge panel struck down most of the State Legislature’s maps in September as Republican partisan gerrymanders, citing the same violations of state constitutional clauses. Republicans elected then to redraw the maps, which were approved by the same court on Monday in a separate order.

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Republican legislators did not immediately respond to the latest order. They could oppose a motion for summary judgment and, should it come, appeal it to the state Supreme Court. But the three-judge panel suggested on Monday that the Republican legislative leaders forgo legal arguments and use the same bipartisan map-drawing process employed to draft the new state legislative districts.

The court’s ban on the House map is only the latest move in a long-running legal battle in which Republicans now appear, however unwittingly, to have stacked the deck against themselves.

Party leaders first produced a House map whose lines were heavily in their favor in 2011, after surging to control of both houses of the State Legislature in elections the previous fall. But in 2016, after battles in both state and federal courts, the United States Supreme Court ruled that two of the 13 districts were racially gerrymandered to dilute black voting power, and ordered them redrawn.

Seeking to avoid any appearance of bias, party leaders said publicly they would draw the new map using political rather than racial parameters, a strategy they said at the time was completely legal. One of the map’s principal drafters boasted in 2016 that he had given Republicans a 10-to-3 edge in seats “because I do not believe it’s possible to draw a map with 11 Republicans and two Democrats.”

While the Supreme Court has ruled that partisan maps are political documents beyond the jurisdiction of the Constitution, it has long held that gerrymanders based on race violate both federal voting rights law and constitutional protections.

Republicans defended the House map on the same grounds in a federal lawsuit, and won at the Supreme Court in June. But in the process, the three-judge panel noted, they left “a detailed record of both the partisan intent and the intended partisan effect of the 2016 congressional districts.”