Legislation introduced last week by a Senate Republican would revoke the charters of Fannie Mae and Freddie Mac and create a new Mortgage Finance Agency for the securitization of single-family and multifamily mortgages. Meanwhile, a separate bipartisan Senate bill still in the works would also dispense with the existing two government-sponsored enterprises while building a new one. Filed on May 23 by Sen. Johnny Isakson, the Mortgage Finance Act of 2013 is patterned on legislation the Georgia Republican proposed in 2011. It would put the GSEs into “irrevocable receivership,” with the Federal Housing Finance Agency tasked as their receiver no later than 18 months after enactment of the bill. “Immediately upon placement of the enterprises into receivership, the FHFA shall commence...