Government regulators continue to wrestle with the controversial risk-retention rule mandated by the Dodd-Frank Act that is widely seen as one key to the prospects for reviving the non-agency MBS market. Officials from one of the agencies involved in the rulemaking told attendees at this week’s annual meeting of the American Securitization Forum that regulators are still studying the landslide of comment letters that came in response to a proposed rule published in April 2011. The extended comment period closed in August. “It is in the nature of the rulemaking process that an advanced notice of proposed...