Voters in eight California counties carried by Donald Trump in the 2024 presidential election backed Proposition 50, the Democrat-backed ballot measure in a state-by-state redistricting battle helping determine who controls the U.S. House in 2026, election data shows.

California voters gave Democrats — and possibly Gov. Gavin Newsom — a major win Tuesday by passing a plan that could help give them five House seats in 2026.

San Joaquin County and the rest of California have begun voting on Prop 50 that could result in the county being divided into five congressional districts.

Billionaire Tom Steyer spent the most on a single ad for the Yes side, much to Democrats’ chagrin. The possible gubernatorial candidate jumped into the Prop 50 fray in October, when he spent about $8.1 million on a spot showing a Trump imitator angrily reacting to a Prop 50 victory.

California's ballot measure gerrymandering congressional lines continues a trend that's eliminated political competition in many House races. The result is today's Washington dysfunction.

The state's top elections official Tuesday asked the Trump administration to point to proof that any irregularities exist.

“The Unconstitutional Redistricting Vote in California is a GIANT SCAM in that the entire process, in particular the Voting itself, is RIGGED,” Trump wrote on Truth Social. “All ‘Mail-In’ Ballots, where the Republicans in that State are ‘Shut Out,’ is under very serious legal and criminal review. STAY TUNED!”