Family Reunification Act This bill directs the Department of Homeland Security (DHS) to ensure that each unaccompanied alien child removed by a federal official or employee from the custody of a parent or legal guardian at or near a port of entry or within 100 miles of the border be reunited with the parent or legal guardian at the earliest possible date unless: a state court terminates the rights of a parent or legal guardian, determines that it is in the child's best interests to be removed from the parent or legal guardian, or makes any similar determination that is authorized under state law; a state or county child welfare official determines that it is in the child's best interests to be removed from his or her parent or legal guardian because the child is in danger of abuse or neglect from the parent or legal guardian; or DHS requires continued separation because the child is a trafficking victim or is at significant risk of becoming a trafficking victim, there is a strong likelihood that the adult is not the child's parent or legal guardian, or the child is in danger of abuse or neglect from the parent or legal guardian.