Testifying before lawmakers Thursday, Ben Bernanke reiterated a call for the Fed to be given supervisory powers over institutions that pose a systemic risk to the financial system, and proposed that a council of regulators help monitor risk.

Ending speculation that he might appoint a new central bank chief, President Obama said he would nominate Fed Chairman Ben Bernanke for a second term Tuesday as the administration continues its efforts to stabilize the embattled U.S. economy.