Washington — The Government Accountability Office is opening an investigation into Federal Housing Finance Agency Director Bill Pulte's recent actions, the watchdog arm of Congress confirmed to CBS News.  The probe stems from a letter from top Senate Democrats, who  wrote to GAO requesting an investigation of Pulte's actions as head of the FHFA. They asked the congressional investigative arm to look into "referrals of New York Attorney General Letitia James, U.S. Senator Adam Schiff, Federal