Henry Paulson, secretary of the U.S. Treasury, left, testifi

UNITED STATES - JULY 15: Henry Paulson, secretary of the U.S. Treasury, left, testifies before the Senate Banking Committee with Ben S. Bernanke, chairman of the U.S. Federal Reserve, center, and Christopher Cox, chairman of the U.S. Securities and Exchange Commission (SEC), in Washington, D.C., U.S., on Tuesday, July 15, 2008. Paulson said the government would buy shares in Fannie Mae and Freddie Mac ``only if necessary'' and called on Congress to approve his plan to shore up confidence in the two largest sources of U.S. mortgage financing. (Photo by Joshua Roberts/Bloomberg via Getty Images)