A dozen or so mortgage, housing and consumer groups are putting the final touches on a new letter to Treasury Secretary Steven Mnuchin, asking that the department not make any radical administrative changes to the operations of Fannie Mae and Freddie Mac, according to industry stakeholders familiar with the matter. The immediate and chief concern is that Federal Housing Finance Agency Director Mel Watt could depart prematurely, throwing the balance of power over to the White House, which would then move to pick a new FHFA director. The industry fears the administration’s pick, working in tandem with Treasury, would then move to cut GSE loan limits as a test to see if the private...