Sonoma County Supervisor Efren Carrillo was arrested in San Diego on Labor Day after an early-morning fight outside a popular nightclub that left one man unconscious.
Carrillo, 31, was booked on charges of battery causing serious injury, a felony, and disturbing the peace, a misdemeanor, San Diego police Lt. Andra Brown said.
Carrillo was released Monday after posting $10,000 bail, according to the San Diego County jail.
He refused to return repeated phone calls seeking comment Wednesday, and his aide said Carrillo would not discuss his arrest until he returns from a trip abroad in nearly two weeks.
The fight broke out at 2:10 a.m. Monday on a street in the city's Gaslamp District, a bustling downtown area crowded with bars and restaurants.
Carrillo issued a written statement Wednesday saying he was protecting female friends who were being harassed by "rowdies" when he stepped in to defend them.
"I was in San Diego for Labor Day weekend on my own personal business. I was socializing with a group of friends when rowdies approached our group and harassed women in our group. I stepped in to protect them. I'm anxious to tell my side of the story during legal proceedings," according to the statement.
Prosecutors have not determined if they will file charges, said Steve Walker, a spokesman for the San Diego County district attorney.
Carrillo's arraignment is set for Oct. 15.
He was scheduled to depart this morning on a long-planned trip to Russia with a 23-member delegation from Fort Ross State Historic Park.