Derek Tran, a first-time Democratic candidate, has flipped a toss-up California House seat, narrowly defeating Republican Rep. Michelle Steel, who conceded on Wednesday after a protracted vote count. Tran had declared victory early this week and currently leads by roughly 600 votes.

Derek Tran defeated Rep. Michelle Steel in California’s 45th congressional district, The Associated Press called Wednesday afternoon. Steel, a two-term incumbent, conceded to Derek Tran Wednesday, Nov. 27, after a long slog of a race, shortly before the race was called around 1 p.m.

Democrat Derek Tran has defeated two-term Republican U.S. Rep. Michelle Steel in a Southern California House district that was specifically drawn to give Asian Americans a stronger voice on Capitol Hill.