The Loudoun County supervisor who has admitted a history of drunken driving and domestic incidents said this week that he is reconsidering his decision to withdraw from the race for board chairman.

Shawn Williams, who was accused nearly a decade ago of a brutal attack on his then-girlfriend, said he is open to running for chairman of the Loudoun County Board of Supervisors as an independent. Williams, currently the Republican supervisor from the Broad Run district, confirmed that petitions are being circulated to make that possible, a development first reported by the blog Firewall NOVA.

“I haven’t made any decisions yet,” Williams said. “There are some people circulating petitions,” he said, “but it’s not an organized effort.” He said he is “keeping all options open.”

Williams had planned to run in the Republican primary for board chairman, but he ended that campaign after his past legal troubles came to light. A party convention nominated Charlie King, a Leesburg lawyer, this month.

The latest development adds another twist to the topsy-turvy political landscape in Loudoun, where a group of conservatives regularly battles with more-moderate Republicans for control of the local GOP and public office.

Shawn Williams (Courtesy Loudoun County)

King has drawn support from conservatives, and Williams, before his legal troubles surfaced, had been lining up support from such establishment figures as the outgoing board chairman, Scott K. York, a Republican and onetime independent, and U.S. Rep. Barbara J. Comstock (R).

Among Williams’s interactions with police was a 2006 case in which his then-girlfriend accused him of a brutal attack.

The woman involved in that case told police that Williams chased her through a condominium in Ocean City, Md., striking her repeatedly, and pushed her into closet doors with such force that they broke. She fled to a restaurant and called 911, according to the police report.

After the incident became widely known, Williams acknowledged the attack and said he regretted it. But he chose to remain in office despite calls for his resignation.

“With every fiber of my being, I wish this incident had not occurred and can’t begin to relay the guilt I harbor,” Williams said in a statement in March. He said that he had undergone treatment for alcohol abuse and anger management and that none of his personal problems had affected his career in public service.

The chairman’s seat is becoming vacant because York is retiring. Along with King, Democrat Phyllis Randall and independent Tom Bellanca are in the race.

Randall, a member of Virginia’s Fair Housing Board and vice chairman of the state Board of Corrections, ran unsuccessfully for the Broad Run seat Williams now holds. Bellanca, a Realtor, ran against York as a Democrat in 2011. (York became an independent after his first term as board chairman but rejoined the Republican Party in 2011.)

Williams, a former Marine who works as a corporate lawyer for Sprint, was elected in 2011 to represent Broad Run, and he has been the board’s vice chairman since 2013.

Two other members of the nine-member, entirely Republican board are retiring this year.

Some conservative activists were backing King before York announced his retirement and endorsed Williams.

King convened a meeting of local party leaders and elected officials in February to discuss “information and historical data” regarding Williams, according to an e-mail shared with The Post. Williams, who was present, quit the race for chairman a day later, explaining in a statement that he had been arrested more than once for drunken driving and that sheriff’s deputies have been called to his home after domestic altercations. He also accused King of running a “whisper campaign” against him.

Should Williams run, “it puts a lot of people in Loudoun at odds between their dedication to the [GOP] nominee or choosing someone who, while in office, has done a very good job,” said Brian Reynolds, who has worked on several Loudoun Republican campaigns.

King declined to comment on the possibility of a renewed Williams campaign. State Sen. Richard H. Black, a prominent conservative Republican from Loudoun, had this to say about that possibility: “I think for him to run, in light of his past problems, is entirely inappropriate.”

State Del. J. Randall Minchew, another Republican from the county, was gentler in his reaction, although he agreed with Black that Williams should not run as an independent.

“Shawn Williams has got a lot to give; he’s a very bright person,” Minchew said. “Practically, Supervisor Williams would be wise to look at the all that came forward and whether he can achieve political viability.”

Laura Vozzella contributed to this report.