Many of those green loans will still be eligible for purchase by the GSEs. Social bonds appear unaffected.

The Structured Finance Association says the GSEs should be able to accept multiple credit scores on a single application and disclose that information to MBS investors.

Testifying before the House Financial Services Committee this week, Federal Reserve Chair Kevin Warsh said any changes to monetary policy — including the Fed’s balance sheet — will be made transparently and communicated in advance to the market.