This post has been updated.

Glenn F. Ivey has made it official. He’s in the race to unseat U.S. Rep. Donna Edwards (D-Md.), setting up an intraparty battle that already has divided local politicians.

Ivey spokesman Ramon Korionoff said the former Prince George’s County prosecutor filed papers with the Federal Election Commission late Tuesday formalizing his candidacy. Last week, Ivey’s campaign confirmed rumors that the 50-year-old lawyer, now in private practice, would run against Edwards.

Edwards, 53, has irritated party leaders in Maryland with her criticism of a congressional redistricting plan that she said would limit the political clout of the state’s growing population of minority voters. Additionally, she’s not closely aligned with Maryland Senate President Thomas V. Mike Miller Jr. (D-Calvert), who played a key role in the redistricting efforts.

A third Democrat, Anne Arundel County Council member G. James Benoit, 40, is exploring a run for the seat, which now stretches into Anne Arundel County.

The Democratic Congressional Campaign Committee, which generally backs incumbents, is supporting Edwards, said spokesman Josh Schwerin.

The newly drawn 4th congressional district includes most of Prince George’s, as well as part of Anne Arundel, and eliminates a section of Montgomery County where Edwards had enjoyed strong support.