The only Republican candidate in the crowded field to succeed South Bay state Sen. Ted Lieu has been booted from the June ballot, though he may appeal the decision in court, the Los Angeles County Registrar-Recorder’s Office said Monday.

Beverly Hills Mayor John Mirisch had hoped to mount a late candidacy for the seat, which includes the South Bay as well as Beverly Hills and West Los Angeles, but there was a problem with his signatures. He needed 40 signatures, but the Registrar-Recorder’s Office rejected 12 of the 49 on his nominating papers. According to the Beverly Hills Courier, some of the signatures were thrown out because the home addresses were filled out by the person who gathered the signature, rather than the signee.

“Nothing has changed since our determination that the paperwork was insufficient,” Elizabeth Knox, a spokeswoman for the county clerk, wrote Monday in an email. “His only recourse is additional court intervention and we have been informed he is seeking that.”

Mirisch is represented by the Sacramento-based law firm of Bell, McAndrews & Hiltachk LLP. Attorneys at the firm did not respond to requests for comment Monday.

The firm has already gone to court on Mirisch’s behalf. At first, election officials said Mirisch could not appear on the ballot because he had submitted his filing via fax, just hours before the March 12 deadline, and then followed up by sending the documents by overnight mail. But on Friday, a Sacramento state court judge said Mirisch’s faxed documents, which arrived before the deadline, were acceptable and that he could appear on the ballot, provided that his signatures met standards.

Mirisch has said that he filed at the last minute because he was not asked to run for the seat by the Senate Republican Caucus until just before the deadline. At the time, he was in Washington, D.C., for the National League of Cities Congressional Conference.

According to the Courier, Mirisch determined Monday that one of the rejected signatures — which was tossed because the person appeared to live outside the 26th Senate District — was actually valid and the signee was a district resident.

With that signature restored by the registrar’s office, Mirisch was left just two signatures short. The Courier reported that Republican Party officials were working with the registrar to see if it would accept sworn declarations from three couples in cases in which one of the spouses filled out the home address information for both people on the petition.

On Monday, Knox reiterated that the signatures were not satisfactory. “He has been notified that his paperwork was not accepted,” she said

Lieu, a Democrat, is giving up the 26th Senate District seat in his bid to replace retiring congressional veteran Henry Waxman.

The newly redrawn district stretches along the coast from the Palos Verdes Peninsula to Pacific Palisades and juts inland to take in Beverly Hills, West Hollywood and part of Hollywood. Among the eight other candidates in the race are seven Democrats — including front-runners Betsy Butler, Sandra Fluke, Amy Howorth and Ben Allen — and one independent.

Dave Jacobsen, a spokesman for Howorth, said in an email that he was notified Monday that Mirisch would not be joining the race.

“Our campaign just received a call from a representative of the L.A. County Registrar-Recorder’s Office stating that John Mirisch will not be on the SD26 ballot,” Jacobsen said. “The representative said that the county counsel is not allowing them to challenge the signatures.”

City News Service contributed to this article.