In any action for divorce, legal separation, paternity, or guardianship in which children are involved, the court, upon its own motion or by motion or agreement of the parties, may appoint a parenting coordinator to assist the parties in resolving issues or disputes related to parenting time. A party, at any time before the appointment of a parenting coordinator, may file a written objection to the appointment on the basis of domestic violence having been committed by another party against the objecting party or a child who is a subject of the action. After the objection is filed, a parenting coordinator may not be appointed unless, on the request of a party, a hearing is held and the court finds that a preponderance of the evidence does not support the objection. If a parenting coordinator is appointed, the court shall order appropriate measures be taken to ensure the physical and emotional safety of all parties and children.