U.S. Treasury Secretary Timothy Geithner Tuesday urged the Securities and Exchange Commission to pursue new rules for money-market mutual funds, triggering fresh opposition from industry leaders who had beaten back similar proposals and are pursuing a weaker overhaul.

Geithner, heading a Washington meeting of the Financial Stability Oversight Council, a group formed by the Dodd-Frank Act to address systemic financial risks, won unanimous approval for a draft recommendation to the SEC spelling out three ways to overhaul the $2.6 trillion industry. A new option would require capital buffers of as much as 3 percent of assets, while two other solutions he offered were opposed earlier by the fund industry and rejected in August by an SEC majority.