Prop 50 Lawsuit: DOJ Intervention, Ruling, and SCOTUS Denial

The Prop 50 lawsuits are a set of federal challenges brought by the California Republican Party, individual Republican voters and candidates, and the Trump administration’s Department of Justice, all arguing that California’s new Democrat-drawn congressional maps are unconstitutional racial gerrymanders. A three-judge federal panel denied a preliminary injunction on January 14, 2026, and the U.S. Supreme Court refused to intervene on February 4, 2026, clearing the maps for the 2026 elections. The consolidated merits case remains pending in the Central District of California.

Who Sued and What They Argued

Three separate suits were filed, and all ended up before the same three-judge panel.

The first was Hilton v. Weber, filed September 4, 2025, by Republican gubernatorial candidate Steve Hilton before voters had even approved Prop 50. Hilton alleged the redistricting measure would violate the one-person, one-vote rule and the state constitution’s bar on mid-decade redistricting. The court dismissed the case for lack of standing on November 4, 2025, and Hilton voluntarily dismissed it the same day.¹

The central case is Tangipa v. Newsom, filed November 5, 2025, the day after voters passed Prop 50. Plaintiffs are the California Republican Party, Republican Assemblymember David Tangipa, and a group of Republican voters. They sued Governor Gavin Newsom and Secretary of State Shirley Weber, alleging the new maps constitute racial gerrymandering in violation of the Fourteenth and Fifteenth Amendments. Tangipa argued the maps caused “stigmatic and representational injury” by placing him in a district drawn for a specific racial or ethnic group, and the challengers contended the legislature relied too heavily on race in drawing 16 congressional districts.²

A third suit, Noyes v. Newsom, was filed December 2, 2025, by three California voters represented by the Public Interest Legal Foundation. Its focus was different from Tangipa’s Fourteenth Amendment theory: the Noyes plaintiffs brought stand-alone Fifteenth Amendment and Voting Rights Act Section 2 claims, alleging intentional racial goals in drawing the maps. They pointed to what they described as 16 Hispanic-majority districts held within an “implausibly tight” population band of 52% to 55%.³ Noyes was initially stayed and then consolidated into the Tangipa docket on March 17, 2026, with a single consolidated complaint ordered by March 27.⁴

DOJ Intervention and the Dhillon Recusal

On November 14, 2025, the court granted the Trump administration’s Department of Justice permission to intervene on the side of the challengers. The DOJ alleged the Prop 50 maps mandated “racially gerrymandered congressional districts” in violation of the Equal Protection Clause and Section 2 of the Voting Rights Act, asserting that California lawmakers had treated citizens as “components of a racial class” and manipulated district lines “in the name of bolstering the voting power of Hispanic Californians because of their race.” The department asked the court to invalidate the Prop 50 map and reinstate the 2021 commission-drawn map.⁵

The intervention created an unusual conflict issue. The Dhillon Law Group, founded by Harmeet Dhillon, filed the underlying Tangipa suit. Dhillon at the time led the DOJ’s Civil Rights Division. She said she was recused from the Prop 50 matter because of her connection to the firm, and the case was handled instead by her deputy, Principal Deputy Assistant Attorney General Jesus A. Osete.⁵

The Democratic Congressional Campaign Committee was also granted intervention, but on the defense side, on November 12, 2025.⁶

The December 2025 Hearing

The three-judge panel — U.S. District Judges Josephine Staton and Wesley Hsu and Ninth Circuit Judge Kenneth K. Lee — heard argument in Los Angeles starting December 15, 2025, on motions for a preliminary injunction to block the maps before the 2026 primary.⁷

A defining moment of the hearing was who did not testify. Paul Mitchell, the demographic consultant who drew the maps for state lawmakers, lived more than 100 miles from the courthouse, placing him outside subpoena range. Plaintiffs wanted to compel his testimony on whether he intentionally tried to boost the voting power of specific racial groups. The court denied the request, though it questioned Mitchell’s “blanket use of ‘legislative privilege'” to resist producing documents.²

Expert witnesses filled part of the gap. Anthony Fairfax, a demographic and mapping consultant called by the defense, testified that plaintiffs’ key expert report by Sean Trende looked only at race and partisanship while ignoring traditional criteria like minimizing splits of political subdivisions. Fairfax concluded that “race did not predominate in the creation of” the contested 13th Congressional District and that the 2021 and 2025 plans were “very similar” on traditional metrics.⁸

The January 2026 Ruling

On January 14, 2026, the panel denied the preliminary injunction 2-1. Writing for the majority, Judge Staton held that challengers “failed to show that racial gerrymandering occurred” and that there was “no basis for issuing a preliminary injunction.”⁹

The decision turned on the distinction between partisan and racial motivation. The majority found a “mountain of statements reflecting the partisan goals of Proposition 50,” countered only by a “molehill of statements showing race consciousness.” Mere race consciousness, the court wrote, was “not enough to make the necessary showing that the relevant decisionmakers — here, the electorate — enacted the new map for racial reasons.”¹⁰ Staton noted that Republican plaintiffs themselves had characterized Prop 50 during the campaign as a “political power grab” rather than a racial one.⁹

The majority acknowledged it was addressing an “issue of first impression” by focusing on voter intent rather than the intent of the mapmaker or individual legislators. Because Prop 50 was a ballot measure approved by millions of voters, the court held that the voters’ purpose, not Mitchell’s, was the “dispositive inquiry” for evaluating racial predominance.¹¹

Judge Lee dissented. He argued the majority had committed “outcome-determinative errors of law” by adopting a “novel and unworkable” framework that ignored Supreme Court precedent treating the mapmaker’s testimony as direct, highly probative evidence of legislative intent. Lee said race likely played a “predominant role” in at least the 13th Congressional District and called the plan a “racial spoils system.”⁹

The Supreme Court Denies the Emergency Application

Two days after the panel also refused an injunction pending appeal on January 16, the challengers went to the Supreme Court. On January 20, 2026, the California Republican Party, Tangipa, and the other plaintiffs filed an emergency application directed to Justice Elena Kagan, who handles Ninth Circuit matters. They asked the Court to block use of the Prop 50 maps and temporarily restore the 2021 commission-drawn maps, stressing that candidate filing opened February 9.¹¹

The Public Interest Legal Foundation filed an amicus brief on January 23 arguing that the panel had used the wrong constitutional test. Under the Fifteenth Amendment, PILF argued, racial intent as even a “motivating factor” is enough to invalidate a map, a stricter rule than the Fourteenth Amendment’s predominance standard. PILF also cited the 1964 case Lucas v. Forty-Fourth General Assembly for the proposition that “fundamental rights may not be submitted to vote.”¹²

On February 4, 2026, the Court denied the application in a brief, unsigned order with no public dissents. Justice Samuel Alito, joined by Justices Clarence Thomas and Neil Gorsuch, wrote a concurring statement observing that the “impetus for the adoption of the Texas map (like the map subsequently adopted in California) was partisan advantage pure and simple.”¹³ The ruling arrived five days before candidate filing opened, clearing the maps for the 2026 midterms.¹⁴

Why the Texas Ruling Shaped the California Outcome

The Prop 50 litigation played out against a parallel fight over Texas’s mid-decade redistricting. On December 4, 2025, the Supreme Court issued a 6-3 stay in Abbott v. League of United Latin American Citizens, allowing Texas to use its challenged maps for 2026. The Court found Texas likely to succeed on the merits, faulting the lower court for failing to honor the “presumption of legislative good faith” and for not drawing an adverse inference against plaintiffs who did not produce an alternative map achieving the state’s partisan goals without relying on race.¹⁵

That framework cut against the California challengers as well. Because California, like Texas, claimed its redistricting was driven by partisan aims, challengers bore the heavy burden of “disentangling race and politics” under the Supreme Court’s 2024 decision in Alexander v. South Carolina State Conference of the NAACP.¹⁶ Justice Kagan’s dissent in Abbott framed the pattern bluntly: overtly partisan mid-decade redistricting had become common in both red and blue states, with California drawing its maps “for the stated purpose of counteracting what Texas had done.” The two rulings together roughly canceled out the partisan gains from either state going into 2026.¹³

Where the Case Stands

The Prop 50 maps are in effect for the 2026 election cycle. The Supreme Court’s February 2026 order resolved only the emergency injunction; the underlying merits of the consolidated Tangipa v. Newsom case remain pending before the same three-judge panel in the Central District of California, with Noyes now folded in.⁴ A separate Supreme Court case, Louisiana v. Callais, which could curtail the use of race in redistricting more broadly, was also pending as of mid-2026 and could affect the California challenge if the Court issues a retroactive ruling.²

1
Civil Rights Litigation Clearinghouse. Hilton v. Weber
2
CalMatters. Proposition 50 Republican Lawsuit Hearing
3
Public Interest Legal Foundation. Noyes v. Newsom Complaint
4
Loyola Law School. Noyes v. Newsom Consolidation Order
5
U.S. Department of Justice. Justice Department Sues Gov. Gavin Newsom
6
Democracy Docket. DOJ Seeks to Back GOP’s California Redistricting Lawsuit
7
Bloomberg Law. California’s Redistricting Case Lacks Snarls That Caught Texas
8
Black Chronicle. Witnesses Testify During Second Day of Prop 50 Lawsuit Trial
9
KQED. Federal Judges Uphold California’s New Congressional Maps Favoring Democrats
10
Elias Law Group. Federal Court Rejects Trump DOJ and GOP Challenge to California’s Proposition 50 Congressional Map
11
U.S. Supreme Court. Emergency Application for Injunction Pending Appeal, Tangipa v. Newsom
12
U.S. Supreme Court. PILF Amicus Curiae Brief, Tangipa v. Newsom
13
WFDD. The Supreme Court Lets California Use Its New Democratic-Friendly Congressional Map
14
SCOTUSblog. Supreme Court Allows California to Use Congressional Map Benefitting Democrats
15
SCOTUSblog. Supreme Court Allows Texas to Use Redistricting Map Challenged as Racially Discriminatory
16
U.S. Supreme Court. Abbott v. League of United Latin American Citizens