The US Justice Department have entered the fray in a legal challenge initiated by California Republicans, aiming to block the state's recently passed electoral boundaries.
This court case, filed in federal court, targets the map championed by the state's Democratic governor, which was developed in response to a Republican-led gerrymander in Texas.
"California's redistricting scheme represents a brazen power grab that violates civil rights and undermines the electoral system," stated the nation's top law enforcement official.
Democrats have expressed confidence that the redistricting plan will survive legal scrutiny.
"These opponents lost at the ballot box and soon they will face defeat in the judicial system," stated a spokesperson for Governor Newsom.
The legal challenge claims that California's map wrongfully utilized race as a factor to heavily favor Hispanic voters in contravention of the federal constitution.
"It is unconstitutional to use race as a substitute to advance political interests, but that is precisely what the state legislature did with the redistricting measure," stated a high-ranking representative from the DOJ's civil rights unit.
This courtroom confrontation constitutes the most significant response by Democrats in the continuing redistricting war that began in Texas and has extended to multiple states.
Unlike other states, where GOP-controlled legislatures have enacted gerrymanders, California's plan needed voter approval, which it received with approximately two-thirds of the vote.
Democrats need to flip just a handful of Republican-held House seats to gain majority of the chamber in next year's midterm election.
The party that holds the controlling share will shape the remaining period of the current administration, deciding if a GOP-controlled legislature will continue to deliver its political program or encounter opposition, congressional probes and potential additional obstacles.