The US Justice Department have entered the fray in a legal challenge initiated by California Republicans, seeking to block the California's recently passed congressional redistricting map.
This court case, submitted to a US district court, targets the map championed by Governor Gavin Newsom, which was created in reaction against a Republican-led gerrymander in Texas.
"California's electoral map constitutes a brazen power grab that tramples on civil rights and undermines the democratic process," stated the US attorney general.
Democrats have expressed confidence that the new maps will withstand court challenges.
"The plaintiffs were defeated in the election and soon they will also lose in court," commented a spokesperson for Governor Newsom.
The legal challenge asserts that California's map wrongfully utilized 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 California General Assembly did with the redistricting measure," argued a senior official from the Civil Rights Division.
This courtroom confrontation constitutes the major counterpunch by Democrats in the ongoing political battle that began in Texas and has extended to multiple states.
Unlike other states, where Republican state legislatures have implemented partisan maps, California's plan required public consent, which it received with nearly 65% of the vote.
Democrats need to flip just a small number of GOP-controlled House seats to gain majority of the House of Representatives in next year's midterm election.
The party that holds the majority will shape the final years of the current administration, determining whether a unified Republican Congress will continue to deliver its agenda or encounter opposition, congressional probes and potential additional obstacles.