The results of Tuesday night’s Proposition 50 vote are still coming in, but California Republicans have already filed a federal lawsuit to try to stop the results of the statewide redistricting effort, calling it “unconstitutional” and “racial gerrymandering.”
Newport Beach-area law firm Dhillon Law Group partner Mike Columbo and counsel Mark Meuser announced Wednesday morning that they had filed the lawsuit on behalf of California Assemblyman David Tangipa, the entire California Republican Party, and multiple Republican voters challenging Prop 50.
The Dhillon Law Group, Assemblyman David Tangipa, 18 California Voters, and the California Republican Party File Federal Lawsuit Challenging Prop 50 https://t.co/ZEi5R2OXSc
— California Republican Party (@CAGOP) November 5, 2025
The lawsuit alleges that the vote unconstitutionally gerrymanders districts in violation of the Fourteenth and Fifteenth Amendments — the amendments to the United States Constitution that were put into place after the Civil War to ensure equal rights for those who had been enslaved.
This lawsuit follows an unsuccessful legal bid from San Diego Republican Rep. Darrell Issa last month to block the new congressional maps — which he called “the worst gerrymander in history” — from being implemented.
That lawsuit, filed last month in the Northern District of Texas, alleged that Prop. 50 is unconstitutional and “an unprecedented interstate assault on representative democracy.” He was joined by fellow Republican Rep. Ronny Jackson.
A judge dismissed the lawsuit on Oct. 31.
“I’m not going anywhere,” Issa said in a statement. “I’ll continue to represent the people of California — regardless of their party or where they live.”
The 48th Congressional District that the Bonsall Republican represents would lose parts of San Diego County and add more of Riverside County.
Democrats have expressed confidence that their new maps would withstand legal scrutiny.
The Prop 50 vote is currently at 60.7% for redistricting and 39.3% against in San Diego County, and 63.8% for and 36.2% against statewide.
It is not clear how successful the latest challenge will be.
Clarification, Weds. Nov. 5, 12:55 p.m.: A previous version of this article said that Harmeet Dhillon filed the lawsuit. It was actually filled by Dhillon Law Group.
