California Assemblyman Isadore Hall announced his campaign for Congress Friday, ensuring Rep. Laura Richardson will have a Democratic primary challenger no matter what district she ultimately chooses to run in.

Hall announced his campaign in the proposed new south Los Angeles district that includes Gardena, Carson and Compton. The announcement came 90 minutes after state Sen. Alan Lowenthal (D) said he would run in the neighboring Long Beach-based district that was proposed by the California Citizens Redistricting Commission’s first draft map.

Under the proposed map — which is certain to be altered in the next two months — Richardson’s current 37th district would be split into those two new districts, forcing her to choose which one gives her the best chance to win.

LA democratic insiders told Roll Call earlier this week that state Sen. Roderick Wright (D) could also run in the Gardena-Carson-Compton district, and that Richardson will have a challenging primary no matter where she runs.

Hall, a Compton native, is a former president of the Compton Unified School District Board of Trustees. He was elected to the Compton City Council in 2003 and then elected to the state Assembly in 2008.

“I have spent the past few days talking with friends and community leaders about running for this new seat,” Hall said in a statement. “The response has been overwhelming and I am energized by the grassroots support we have already received.”

Isadore’s statement to the press noted that he would not run if Rep. Maxine Waters (D) chooses to seek the seat instead of run in the proposed district her home is currently in. He did not say the same about Richardson.