A pro-Israel super PAC is making a six-figure splash in a toss-up Orange County House race, prompting fierce pushback from its target, Democratic state Sen. Dave Min.

United Democracy Project, the independent expenditure arm of the American Israel Public Affairs Committee, dropped nearly $50,000 in mail pieces opposing Min, according to campaign finance filings. And it is poised to leave a bigger mark starting Tuesday, booking roughly $500,000 in broadcast and cable airtime, according to AdImpact, a campaign ad tracking firm.

Min is one of two Democrats competing to succeed Rep. Katie Porter in her purple seat — a district that Republicans see as a prime pick-up opportunity in the battle for control of the House. The contest has grown increasingly bitter in the lead-up to California’s March 5 primary, with Min and his rival, political activist Joanna Weiss, trading negative attack ads.