Former Member, Budget Committee, United States Senate
Member, Congressional Caucus on Unfunded Mandates
Former Member, Energy and Natural Resources Committee, United States Senate
Former Member, Energy Subcommittee, United States Senate
Former Member, Health Care Subcommittee, United States Senate
Former Member, Multilateral International Development, Multilateral Institutions, and International Economic, Energy, and Environmental Policy Subcommittee, United States Senate
Co-Chair, National Commission on Restructuring the IRS
Former Member, National Parks Subcommittee, United States Senate
Member, National Republican Congressional Committee
Former Member, Near East, South Asia, Central Asia, and Counterterrorism Subcommittee, United States Senate
Member, Republican Policy Committee
Former Chair, Subcommittee on Fiscal Responsibility and Economic Growth, United States Senate
Former Member, Subcommittee on International trade, Customs, and Global Competitiveness, United States Senate
Former Member, Water and Power Subcommittee, United States Senate
Member, Finance
Member, Foreign Relations
Member, Homeland Security and Governmental Affairs
Member, Joint Economic Committee
Chair, Permanent Subcommittee on Investigations
Member, Subcommittee on Africa and Global Health Policy
Member, Subcommittee on Europe and Regional Security Cooperation
Member, Subcommittee on International Trade, Customs, and Global Competitiveness
Member, Subcommittee on Regulatory Affairs and Federal Management
Chair, Subcommittee on Social Security, Pensions, and Family Policy
Member, Subcommittee on State Department and USAID Management, International Operations, and Bilateral International Development
Member, Subcommittee on Taxation and IRS Oversight
Member, Subcommittee on Western Hemisphere, Transnational Crime, Civilian Security, Democracy, Human Rights, and Global Women's Issues