The United Nations Network on Migration Secretariat has the following key functions: provide support to all constituent parts of the Network to enhance collaboration among partners (United Nations system, Member States and other stakeholders) in the implementation of the Global Compact for Safe, Orderly and Regular Migration; oversee the United Nations General Assembly-mandated capacity-building mechanism, including the Migration Network Hub and Migration Multi-Partner Trust Fund; support Member States in their follow-up and review of Global Compact implementation, including through regional reviews and the International Migration Review Forum; and coordinate preparation of the biennial report of the United Nations Secretary-General on the Global Compact.