 Complete the following phrase:  Mayorkas was a member of the presidential transition team for Barack Obama before he assumed office in January 2009, where he led the team responsible for the U.S. Department of Justices Criminal Division. Mayorkas was appointed by President Obama as the director of U.S. Citizenship and Immigration Services USCIS. On May 20, 2009, the nomination was received by the Senate; on August 7, 2009, the nomination was confirmed by the Senate by voice vote. As USCIS director, Mayorkas led United States citizenship through management efficiencies and fiscal responsibility, and safeguarded the integrity of the immigration system. He implemented the Deferred Action for Childhood Arrivals DACA process in sixty days. He led U.S. government efforts to rescue orphaned children following the 