Eric Schneiderman, the New York attorney general, has asked for information about the $8.5 billion settlement Bank of America and representatives of 22 large investment firms holding soured mortgage securities, indicating that he may intervene to challenge the deal. agreed to late last month by Letters sent by Schneiderman’s office to the firms that agreed to the settlement point to concerns by the attorney general that the deal may have been struck without full participation by all investors who would be affected by its terms.