Millions of dollars worth of political TV ads are expected to start airing Tuesday in an effort to sway Californians on a November ballot measure seeking to send more Democrats to Congress and counter President Trump and the GOP agenda, according to television airtime purchases.

The special-election ballot measure — Prop. 50 — will likely shape control of the U.S. House of Representatives and determine the fate of many of Trump’s far-right policies.

The opposition to the rare California mid-decade redistricting has booked more than $10 million of airtime for ads between Tuesday and Sept. 23 in media markets across the state, according to media buyers who are not affiliated with either campaign. Supporters of the effort have bought at least $2 million in ads starting on Tuesday, a number expected to grow exponentially as they are aggressively trying to secure time in coming weeks on broadcast and cable television.

“This early start is a bit stealthy on the part of the no side, but has been used as a ploy in past campaigns to try to show strength early and gain advantage by forcing the opposing side to play catch up,” said Sheri Sadler, a veteran Democratic political media operative who is not working for either campaign. “This promises to be an expensive campaign for a special election, especially starting so early.”

Millions of dollars have already flowed into the nascent campaigns sparring over the Nov. 4 special-election ballot measure that asks voters to set aside the congressional boundaries drawn in 2021 by California’s independent redistricting commission. The panel was created by the state’s voters in 2010 to stop gerrymandering and incumbent protection by both major political parties.

The campaign will be a sprint — glossy multi-page mailers arrived in Californians’ mailboxes before the state Legislature voted in late August to call the special election. Voters will begin receiving mail ballots in early October.

Redistricting, typically an esoteric process that takes place once a decade following the U.S. Census, is receiving an unusual level of attention because of partisan efforts to tilt control of Congress in next year’s midterm election. Republicans have a narrow edge in the U.S. House of Representatives, but the party that wins control of the White House often loses congressional seats in the following election.

Earlier this summer, Trump asked Texas Gov. Greg Abbott to redraw his state’s congressional districts to add five GOP members to the House, setting off a redistricting arms race across the nation. California Gov. Gavin Newsom launched a campaign to redraw the state’s congressional districts in an effort to boost the number of Democrats in Congress, negating the Texas gains for Republicans, but it must be approved by voters.

The coalition opposing the effort is an intriguing mix: former Republican Gov. Arnold Schwarzenegger, wealthy Republican donor Charles Munger Jr., former GOP House Speaker Kevin McCarthy of Bakersfield, Assemblyman Alex Lee (D-San Jose), the chair of the Legislative Progressive Caucus, and Gloria Chun Hoo, president of the League of Women Voters of California.

Many partisans — in both political parties — opposed independent redistricting when it was championed by Schwarzenegger and Munger in 2010.

Jessica Millan Patterson, the former state GOP chairwoman who is leading McCarthy’s effort to oppose new congressional boundaries, demurred when asked about the dissonance. Voters, she said, made their choice clear at the ballot box about their preference to have an independent commission draw congressional districts rather than Sacramento politicians.

“The people of California have spoken,” she said, adding that most voters agree that an independent commission is preferable to partisan politicians drawing districts.

The “Stop Sacramento’s Power Grab” committee that Patterson leads plans to focus on conservative and right-of-center voters, and will be well-funded, she said.

McCarthy was a prodigious fundraiser while in Congress and his long-time friend, major GOP fundraiser Jeff Miller, is raising money to oppose the ballot measure.

Schwarzenegger is not part of the McCarthy effort, instead backing the good-government message of the Munger team. Patterson argues that anything the former governor does only brings more attention to their shared goal, even if he isn’t part of their effort.

“Gov. Schwarzenegger is Gov. Schwarzenegger,” Patterson said, pointing to an X post of the global celebrity wearing a T-shirt that said “Terminate Gerrymandering” while working out on Aug. 15. “He is a celebrity, a box-office guy. He’s going to make sure reasonable people know that we don’t want to put this power back in Sacramento. He will bring the glitz and glamour, like he always does.”

Schwarzenegger has long championed political reform. During his final year as governor, he prioritized the ballot measure that created independent congressional redistricting. Since leaving office, he made good governance a priority at his institute at the University of Southern California and campaigned for independent redistricting across the nation.

“Here are some of the things that are more popular than Congress: hemorrhoids, Nickelback, traffic jams, cockroaches, root canals, colonoscopies, herpes,” Schwarzenegger said in a 2017 Facebook video. “Even herpes, they couldn’t beat herpes in the polls.”

The former governor is reportedly backing the effort by Munger, the son of a billionaire, who bankrolled the ballot measure that created independent congressional redistricting in 2010. Munger has donated more than $10 million to an effort opposing the November ballot measure; the organization he funded has booked more than $10 million in television spots through Sept. 23.

“These ads are the start of our campaign’s effort to communicate directly with voters about the dangers of allowing politicians to choose their voters and abandoning our gold standard citizen-led redistricting process,” said Amy Thoma, a spokesperson for the Munger-backed Voters First Coalition.

Supporters of the effort to redraw the districts argued that Republicans are trying to cement GOP control of the nation’s policies.

“Trump cronies … are spending big to defeat [Prop.] 50 and help Trump rig the 2026 election before a single person [has] voted,” said Hannah Milgrom, a spokesperson for the campaign. “They are spending big — and early — to trick California voters into allowing Trump to keep total control over the federal government for two more years.“