The mayor of Atlantic City, already accused of abusing his teenage daughter, now faces a new charge of asking her to lie about how she suffered a head injury.

Marty Small Sr., 50, was charged Monday with witness tampering involving the girl, whom he and his wife, La’Quetta, superintendent of schools in the coastal New Jersey gambling town, were previously accused of assault and abuse.

The Atlantic County Prosecutor’s Office said Marty Small, a Democrat, asked his daughter to “twist” a statement he had given investigators about his alleged abuse of her sometimes in December and January.

Specifically, the mayor is accused of asking his daughter to falsely say that she suffered a head injury when she tripped and fell in her room.

Small’s attorney, Edwin Jacobs, called the latest charge “pure nonsense,” adding that Small asked his daughter to tell the truth about what happened.

“When a parent encourages a child to be accurate and truthful in his or her statements to investigators, that parent is not manipulating a witness,” he said Wednesday. “That father is doing what a good and responsible father should do. And that is precisely what Marty Small has done.”

Jacobs called the charge “yet another effort by the prosecution to question my client’s paternity and corrupt his relationship with his daughter.”

The attorney did not say whether the teen still lives at home with her parents. Last month, Small said he was doing so.