Civil rights lawyers have asked a federal judge to block what they call “extreme racial gerrymandering” by the Georgia House of Representatives in an attempt to hold on to a Republican majority in the 2018 elections.

The Lawyers’ Committee for Civil Rights Under Law in Washington, D.C., filed a motion for a preliminary injunction late Tuesday in the U.S. District Court for the Northern District of Georgia seeking an expedited hearing in advance of the 2018 elections.