Wolfeboro Police Commissioner Robert Copeland acknowledged using the slur in an email to fellow police commissioners this week.
"I believe I did use the 'N' word in reference to the current occupant of the Whitehouse," Copeland said in the email. "For this, I do not apologize — he meets and exceeds my criteria for such."
In a statement to the Boston Herald, Romney called on Copeland to apologize and resign.
“The vile epithet used and confirmed by the commissioner has no place in our community,” Romney said. “He should apologize and resign.”
Political leaders and residents of Wolfeboro, a predominantly white town, have also called on Copeland to resign. Wolfeboro Town Manager David Owen called Copeland's comments "appalling" and "reprehensible."