SACRAMENTO — Polling places throughout California open today for a special election that could help Democrats’ efforts to quell President Trump’s agenda but, if trends hold, most of the votes may have already been cast.

Voters in California have approved Proposition 50, a ballot proposal to adopt a new congressional map that redraws five districts to be more Democratic-leaning, ABC News projects.

California voters approved Proposition 50 on Tuesday, Nov. 4, in a statewide special election that was announced less than three months prior. And in about a year, Californians will be back at the polls.

The measure is an attempt by Democrats to counteract Republican gerrymanders President Trump has sought in red states. If approved, it would change California’s congressional district boundaries to make it easier for Democrats to flip five seats now held by Republicans.

More than 6.6 million ballots have been returned so far in California’s special election for Proposition 50, according to a data firm used by political campaigns.

After sweeping blue victories, California Democrats warn that President Trump may "rig the rules" of elections.

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

Tuesday is Election Day for California – the primary measure on the ballot: Proposition 50, a measure to redraw California's congressional map.

Proposition 50, a measure to temporarily change California's congressional districts, is being voted on by California voters on November 4th, and if passed, it would add five more Democratic seats to the House of Representatives.

LOS ANGELES - Voters in California will soon decide the fate of Proposition 50, a proposal to temporarily redraw California's congressional district lines in an effort to create more Democratic seats in the House — an effort Gov. Gavin Newsom says will offset a similar move in Texas designed to create more Republican seats.

The proposed redraw of the state’s Congressional districts is expected to add as many as five Democratic-held seats in Congress in time for the 2026 midterms, while leaving as few as four Republican-held seats across California.

The White House said its working on an executive order “to strengthen our elections in this country and to ensure there cannot be blatant fraud.”