A group of Republican voters in New York says Democrats illegally split up conservative Jewish voters in freshly drawn congressional maps as part of a scheme to help Democratic candidates in November.

Election laws require states to strive to place communities with cultural and social ties—known as “communities of interest”—in the same congressional districts. But 14 Republican voters say the New York map shifts Orthodox Jewish and Russian Jewish votes from the state’s 11th district, held by Rep. Nicole Malliotakis (R.), to Democratic strongholds in the 8th, 9th and 10th districts. The result is a map that dilutes Brooklyn Jews’ voting power and creates “a partisan advantage” for Democrats.

“The new map divides closely knit, concentrated Orthodox Jewish and Russian communities with strong social and cultural ties, resulting in conservative Republican-leaning voters spread or ‘cracked’ across multiple districts,” the lawsuit reads.