Republicans seek federal court to block California's new Prop 50 map

California’s New Congressional Maps Face Legal Challenge

California’s secretary of state recently certified that nearly two-thirds of voters supported Proposition 50, a plan by Governor Gavin Newsom to temporarily gerrymander the state’s congressional maps in favor of Democrats. Despite this, Republicans and the Trump administration are hoping that a federal district court panel meeting in Los Angeles will block the use of the new maps for the upcoming election.

The California Republican Party, which filed a lawsuit against Newsom and Secretary of State Shirley Weber just days after the election, argues that the mapmaker used race as a factor in drawing district lines. They claim this gives Latino and Hispanic voters disproportionate influence at the expense of other groups, including white voters. According to the Republicans, this constitutes an illegal racial gerrymander and violates the 14th and 15th amendments.

While Section 2 of the Voting Rights Act permits race-conscious redistricting, the Republicans argue that case law requires minority groups to prove they have been systematically outvoted by a majority that consistently votes together to deny them their chosen candidate.

The Odds Are Slim

Despite the legal challenge, the opponents of Proposition 50 face long odds, especially after the U.S. Supreme Court recently upheld Texas’s new maps, overturning a lower court's finding that Republicans there had engaged in unconstitutional racial gerrymandering.

In a concurring opinion, Justice Samuel Alito wrote that the impetus for the adoption of the Texas map was partisan advantage. The possibility also exists that the Supreme Court may outlaw the use of race entirely in redistricting, which could make California’s new maps—and those drawn by the independent citizens commission—unconstitutional. This would also benefit Republicans in Southern states where several districts were drawn to increase Black Americans’ voting power.

Ailing GOP Has Few Options

The struggling California GOP has few options left for resistance. The passage of Proposition 50 is likely to mark the end for several Republican House members, who must decide whether to run in their current, less favorable districts, switch to new seats, or drop out altogether.

One such member, Rep. Darrell Issa, considered relocating to Texas to run for a Dallas-area seat but was refused endorsement by the president and decided to stay.

Legal Challenge Claims Stigmatic Injury

The legal challenge claims that the Prop. 50 maps cause “stigmatic and representational injury” by placing certain candidates, like Republican Assemblymember David Tangipa of Fresno, into districts drawn with specific racial or ethnic minority groups in mind.

The challengers, including Tangipa, the California Republican Party, several Republican voters, and the Trump White House, are asking a three-judge panel for the Central District of California to grant a preliminary injunction on the maps before Dec. 19, when candidates can start collecting signatures for the 2026 primary ballot.

Testimony and Evidence

During the hearing, the Republican challengers argued that since supporters of Prop. 50 publicly touted increased representation for Latino voters, state lawmakers and consultant Paul Mitchell must justify how their new districts meet the standard for permissible racial gerrymanders.

Tangipa claimed that even though Democratic lawmakers intended primarily to increase their party’s ranks based on political ideology, they used race to justify that goal.

Limited Evidence

The plaintiffs sought to have Mitchell testify, but the court denied a request to force him to take the stand. Since Mitchell lives more than 100 miles away from the court, he was out of the reach of a subpoena. Still, the judges questioned his blanket use of “legislative privilege” to resist producing documents the plaintiffs requested.

Focus on Public Statements

A redistricting expert testified during the hearing, and the plaintiffs focused on a line from Democratic former Senate President Pro Tem Mike McGuire’s public statement after the Legislature passed the package of bills paving the way for the Nov. 4 special election.

“The new map makes no changes to historic Black districts in Oakland and the Los Angeles area, and retains and expands Voting Rights Act districts that empower Latino voters to elect their candidates of choice,” McGuire’s statement said.

McGuire announced last month that he will challenge Republican Rep. Doug LaMalfa in one of the newly configured Prop. 50 seats.

Proponents Argue for Partisan Advantage

Proponents of the new maps argue that any increase in voting power for certain ethnic or racial groups was incidental. They maintain that the maps were created purely for partisan advantage.

“Even if we assume that the Legislature improperly considered race, ultimately it went into effect because it was endorsed by the voters,” said Emily Rong Zhang, an assistant professor of law at the University of California at Berkeley School of Law.

Uncertainty Over Supreme Court

One unknown is how the Supreme Court will rule on a case that questions whether it’s constitutional to consider race when redistricting. The justices are weighing in on another ongoing case, Louisiana v. Callais, whether to strike down a part of the federal Voting Rights Act that requires the creation of districts in which racial and ethnic minorities have a chance to elect their preferred candidate.

If the ruling is retroactive, a decision to strike it down could invalidate both California’s old and new maps.

Other States Join Redistricting Efforts

Regardless of how the Supreme Court rules, other states have jumped into the redistricting effort or are contemplating entering the fray. In addition to Texas and California, four other states have already implemented new congressional maps, according to the National Conference of State Legislatures. Virginia, Maryland, and Florida have also taken some steps toward redistricting.