Federal authorities has entered the fray in a legal challenge initiated by California Republicans, aiming to halt the state's newly approved electoral boundaries.
This court case, submitted to federal court, challenges the map championed by Governor Gavin Newsom, which was developed in response to a GOP redistricting effort in Texas.
"California's redistricting scheme represents a brazen power grab that tramples on voting rights and mocks the electoral system," stated the US attorney general.
The Democratic party have expressed confidence that the redistricting plan will survive legal scrutiny.
"The plaintiffs were defeated in the election and soon they will face defeat in the judicial system," stated a spokesperson for Governor Newsom.
The lawsuit claims that California's map improperly used racial considerations to significantly advantage Hispanic voters in violation of the US Constitution.
"Race cannot be used as a substitute to further partisan goals, but that is precisely what the state legislature did with the redistricting measure," argued a senior official from the DOJ's civil rights unit.
This courtroom confrontation represents the most significant counterpunch by the Democratic party in the continuing redistricting war that started with Texas and has extended to various parts of the country.
In contrast to elsewhere, where GOP-controlled legislatures have enacted gerrymanders, California's plan needed public consent, which it received with nearly 65% of the vote.
The Democratic party need to flip just a small number of GOP-controlled House seats to gain majority of the House of Representatives in next year's congressional elections.
The party that holds the controlling share will shape the final years of the current administration, determining whether a unified Republican Congress will persist in implementing its political program or encounter opposition, investigations and potential additional obstacles.