With the scandal over conflicts of interest in student loans continuing to grow, Education Secretary Margaret Spellings is pledging tougher enforcement of ethics rules, as the Education Department released more information about sale of stock in a lender by an official who works on student loan issues.

And in a sign of just how volatile the loan industry is today (and how lucrative it remains), reports emerged Friday morning that Sallie Mae, the industry giant, is in talks to be bought out by private equity in a deal for more than $20 billion, according to The New York Times.

A statement released by the department late Thursday said that Spellings has asked Susan Winchell, the department’s chief ethics officer, to review “best practices” on its own financial disclosure forms to identify ways that the department might improve. Spellings also has directed that each financial disclosure form now be reviewed by at least two lawyers.

Last week, Spellings placed on leave Matteo Fontana, an Education Department official who works on student loan issues, after the New America Foundation reported that he had sold at least $100,000 in stock in the Education Lending Group, which owned Student Loan Xpress, a lender at the center of the current controversy...

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