ALBANY, N.Y. (AP) — A judge on Wednesday threw out the boundaries of the only congressional seat in New York City represented by a Republican, ordering the state to redraw the district on the grounds that its current composition unconstitutionally diluted the votes of Black and Hispanic residents.

Republicans are expected to appeal the decision, as a new front opens in a national gerrymandering battle that has both political parties jockeying for advantage in the fight over control of the U.S. House.

About a third of states have considered redrawing their House districts since President Donald Trump began pushing for Republicans to craft new congressional lines to help his party hold onto its narrow House majority in this year’s midterms. Democrats have countered by launching their own redistricting efforts, though they have sometimes been hampered by laws they passed intended to prevent partisan gerrymandering.

In New York, Judge Jeffrey Pearlman handed Democrats an early win in the fight, ruling that a district held by Republican U.S. Rep. Nicole Malliotakis in southern Brooklyn and Staten Island should be reconfigured.

The case, filed by an election law firm aligned with the Democratic Party, argued the current lines of the district were drawn without accounting for a rise in Staten Island’s Black and Latino residents, thereby diluting their voting power.

Republicans had bashed the lawsuit as a clear effort to game the district to help Democrats and eliminate one of the few remaining GOP districts in the state.

In a statement, Malliotakis said, “This is a frivolous attempt by Washington Democrats to steal this congressional seat from the people and we are very confident that we will prevail at the end of the day.”

Gov. Kathy Hochul, a Democrat, had vowed to wade into the national redistricting fight but had few legislative avenues to substantially change the state’s congressional lines before the election.

The state’s current map was drawn by Democrats in the state Legislature and signed into law by the governor, designed to give their party a boost in a few battleground districts ahead of the 2024 elections. Democrats picked up a few seats in New York under that map, though Republicans eventually won a House majority.

Anthony Izaguirre, The Associated Press