Incumbent Democrat Derek Tran secured the top spot in California's June 2 nonpartisan primary for the 45th congressional district, advancing alongside Republican Chuong Vo as the leading GOP candidate. Multiple Republican contenders, including Chi Charlie Nguyen, Tom Vo, and Amy Phan West, split the vote in the Orange County-based district. The outcome reflects Tran's established position following his 2024 victory and the fragmented Republican field ahead of the November general election. No other major developments have altered the candidate lineup since filing closed in March.