Virginia state Sen. Dick Black (R) is entering the race for retiring Rep. Frank Wolf's (R-Va.) seat.
Black's entrance sets up a potentially contentious battle between the socially conservative Black and Virginia Del. Barbara Comstock (R), the choice of establishment Republicans.
"I'm running," Black tells NBC's local affiliate. "I'm going to be running, so we just have to get the papers filed and that type of thing."
Some Republicans are nervous about having Black as the nominee. He has stirred controversy on social issues in the past and last year compared abortion clinics to Auschwitz.
He also once handed out plastic fetuses ahead of a vote in the statehouse on abortion legislation.
Local Virginia Republicans have yet to decide whether they'll choose a candidate in a nominating convention or open the race up to a primary.