The California Supreme Court on Wednesday rejected an attempt by Republican legislators to delay Democrats from gerrymandering the state’s congressional districts. The justices said the emergency petition, filed earlier this week, “failed to meet their burden of establishing a basis for relief at this time under” the California Constitution.

California Democrats may have successfully muscled a new congressional map through the state legislature this week, but the redistricting fight in the Golden State is only just beginning.

Republican legislators in California announced Wednesday that they are sending a letter to the U.S. Department of Justice and to the U.S. Attorneys representing California, calling for a potential federal investigation into who is behind the proposed new congressional maps in California and how they were constructed.

According to the Campaign Legal Center, Johnson’s campaign committee began paying $2,500 a month to Issa this past March for a Washington, D.C., property he uses as a residence.

California Gov. Gavin Newsom signs legislation setting November election on US House map designed to boost Democrats