Specifically, investigators are asking for hiring, travel and expense records for ten of Espada's current and former Senate employees who also served as employees or board members for Espada's non profit, Soundview.
Espada is accused of looting Soundview to the tune of $14 million over five years. He's also accused of packing the Soundview board with friends, family members and people who relied on him, including Senate employees.
Those board members are accused of signing off on exorbitant perks for Espada, including a housing allowance, tens of thousands of dollars in meals and a 9 million dollars severance package.
Investigators tell NBCNewYork.com one question is whether Espada may have rewarded board members with government jobs in return for signing off on those perks.