Federal authorities has entered the fray in a lawsuit initiated by California Republicans, aiming to halt the state's newly approved electoral boundaries.
This legal action, submitted to federal court, targets the redistricting plan championed by the state's Democratic governor, which was created in reaction against a GOP redistricting effort in Texas.
"California's electoral map constitutes a blatant attempt to seize control that violates voting rights and mocks the democratic process," stated the US attorney general.
The Democratic party have expressed confidence that the redistricting plan will survive court challenges.
"These opponents lost at the ballot box and they are likely to face defeat in the judicial system," stated a representative for the governor.
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 proxy to further partisan goals, but that is exactly what the California General Assembly did with the redistricting measure," stated a high-ranking representative from the Civil Rights Division.
The legal battle represents the most significant counterpunch by Democrats in the continuing redistricting war that started with Texas and has spread across multiple states.
Unlike other states, where Republican state legislatures have implemented partisan maps, California's plan required voter approval, which it obtained with nearly 65% of the vote.
Democrats need to flip just a small number of Republican-held House seats to gain majority of the House of Representatives in next year's congressional elections.
The political group controlling the majority will shape the final years of the sitting president's term, deciding if a GOP-controlled legislature will continue to deliver its political program or face resistance, congressional probes and potential further challenges.
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