“This means that as of January of 2027, I will very sadly no longer represent the portions of Placer and Yuba County that are merged into the new District 4 (which stretches all the way to wine country),” he wrote on X.

“This is truly a painful decision to make, as I love these communities and have represented some of them for 9 years, between Congress and the Legislature. I do want to emphasize that I will still represent all of my current constituents for the next year. So please don’t hesitate to be in touch if we can be of service!” he added.

It’s unclear where Kiley is thinking of running, but his decision to nix any run in the 4th District narrows his options. If he runs in his original district, he’ll face a newly Democratic district.

California voters passed Gov. Gavin Newsom’s (D-CA) Proposition 50 64.4% to 35.4% in November 2025, allowing lawmakers to redraw congressional lines in the state. The proposition aimed to push several Republican incumbents, including Kiley, out of office.

Kiley, unlike many Republican lawmakers, opposed any partisan redistricting efforts, including those in Texas. The California effort was in response to the Texas redistricting, which favored Republicans.

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Many California Republican incumbents are still weighing whether to run for reelection. Rep. Darrell Issa (R-CA) pondered running in Texas before changing his mind. Reps. Ken Calvert (R-CA) and Young Kim (R-CA) will need to spar over the state’s 40th Congressional District after the state’s redistricting forced Calvert to run in Kim’s district.

Rep. David Valadao (R-CA) is running for reelection but is unlikely to win his district, which was made much bluer after the redistricting proposition. Another California Republican, Rep. Doug LaMalfa, died last week. The person elected in his place, likely a Republican, will also face steep odds.

LaMalfa’s former district is now more left-leaning than Kiley’s, making the 1st Congressional District an unlikely choice as well. The 5th District, currently held by Rep. Tom McClintock (R-CA), would be the only area Kiley could run that remains Republican-leaning.