Two new bills aimed at increasing non-agency activity were introduced in the Senate last week. One would wind down the government-sponsored enterprises while the other would establish a framework for covered bonds. S. 1834, “The Residential Mortgage Market Privatization and Standardization Act” introduced last week by Sen. Bob Corker, R-TN, would gradually reduce the portion of the mortgage-backed security guarantee provided by Fannie Mae and Freddie Mac. Within 180 days of the bill’s enactment, the GSEs could only issue MBS with a guarantee for 90 percent of a bond. The guarantee on...