Mary Jo White (L), Chair of U.S. Securities and Exchange Commission, and Gary Gensler, Chairman of U.S. Commodity Futures Trading Commission, testify before the U.S. Senate Banking, Housing and Urban Affairs Committee during a hearing on "Mitigating Systemic Risk in Financial Markets through Wall Street Reforms", on Capitol Hill in Washington D.C., capital of the United States, July 30, 2013. [Photo/Xinhua]