Democrat Ammar Campa-Najjar advanced to the run-off in the race to fill the vacancy left by disgraced former Republican Rep. Duncan Hunter Duncan HunterDCCC reserves new ad buys in competitive districts, adds new members to 'Red to Blue' program Wife of former Rep. Duncan Hunter sentenced to 8 months of home confinement Harris endorses Democrat in tight California House race MORE in California's 50th District.

Campa-Najjar will likely face either former Rep. Darrell Issa Darrell Edward IssaDCCC reserves new ad buys in competitive districts, adds new members to 'Red to Blue' program Wife of former Rep. Duncan Hunter sentenced to 8 months of home confinement Harris endorses Democrat in tight California House race MORE (R-Calif.), who's attempting a congressional comeback, or former San Diego City Councilman Carl DeMaio, who were running second and third respectively in the all-party primary held on Tuesday.

Issa, best known for his tenure as House Oversight Committee chairman during the Obama administration, is running to represent a San Diego-area district that neighbors the one he previously held.

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Campa-Najjar is attempting his second attempt after losing to Hunter by less than four points in 2018. He previously worked as a deputy regional field director for former President Obama's reelection campaign in 2012 and later secured a position in the Labor Department leading the Office of Public Affairs for the Employment and Training Administration.

Hunter resigned in January after pleading guilty to a corruption charge related to illegally spending at least $150,000 in campaign funds for personal use.