Industry groups have rallied around a bill introduced to stop what a bipartisan group of senators call a “back door tax,” by raising guaranty fees. Sens. Mike Crapo, R-ID, and Mark Warner, D-VA, introduced the bill in Congress last week. The bill, S. 752, stipulates that a congressionally mandated increase of guarantey fees imposed on Fannie Mae and Freddie Mac business can only be used for deficit reduction. The goal is to prevent Congress from using Fannie and Freddie to fund unrelated spending. They also want to establish a scorekeeping rule to ensure that any increases in guaranty fees of the GSEs won’t be used to...