The Federal Housing Finance Agency needs to do more to oversee the legal expenses of Fannie Mae and Freddie Mac, though it has limited tools at its disposal to curtail GSE litigation, according to the FHFA’s Office of Inspector General. The OIG’s report, issued this week, noted that the two GSEs have racked up a significant number of billable hours, both before and after being placed in government conservatorship in September 2008, for their defense in lawsuits, investigations and administrative actions.