Roles of nursing leaders and nursing managers in the issue of using contract employees

What are the different roles of nursing leaders and nursing managers in the issue of using contract employees in the hospitals( travel nurses), and what are the different approaches they take to address the issue and promote patient safety and quality care? Please support your rationale by using the theories, principles, skills, and roles of the leader versus the manager. What are the additional aspects managers and leaders would need to initiate in order to ensure professionalism throughout diverse health care settings while addressing the issue of contract employees ( travel nurses).