Rep. Michelle Steel, a two-term incumbent in California’s 45th congressional district, appears to have conceded to Derek Tran Wednesday afternoon after a long slog of a race that is one of the nation’s closest remaining contests yet to be called.

The 45th District was among the country's most competitive races, critical to both parties as they battled to control the House of Representatives

Derek Tran, a first-time Democratic candidate, has flipped a toss-up California House seat, narrowly defeating GOP 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.