Obama held assignments on the Senate Committees for Foreign Relations, Environment and Public Works and Veterans' Affairs through December 2006. In January 2007, he left the Environment and Public Works committee and took additional assignments with Health, Education, Labor and Pensions and Homeland Security and Governmental Affairs. He also became Chairman of the Senate's subcommittee on European Affairs. As a member of the Senate Foreign Relations Committee, Obama made official trips to Eastern Europe, the Middle East, Central Asia and Africa. He met with Mahmoud Abbas before Abbas became President of the Palestinian National Authority, and gave a speech at the University of Nairobi in which he condemned corruption within the Kenyan government.