The U.S. Senate Committee on Banking, Housing and Urban Affairs' ranking member, Sen. Elizabeth Warren, together with Sen. Ron Wyden of the Senate Finance Committee, sent a letter to Treasury Secretary Scott Bessent requesting information on whether the Treasury Department gave two Department of Government Efficiency employees improper access to the Bureau of the Fiscal Service's payment systems in early 2025. The request was prompted by recent Government Accountability Office reports and focuses on the scope of the access, whether controls were breached, and what Treasury has done to prevent a recurrence. The letter argues that weaknesses in access controls could pose material operational and data security risks because the Bureau of the Fiscal Service handles nearly 90% of federal payments, processes more than 1.2 billion transactions a year, and holds sensitive personal information. It cites GAO findings that one DOGE employee was not made to agree to Treasury IT security rules and that Treasury failed to detect improper payment information transmissions. According to the letter, that employee could for a short period view sensitive financial information and had the ability to delete data and introduce inaccuracies. A second DOGE employee was given "over the shoulder access," meaning they could not directly log into the systems but could ask bureau staff to provide payment system data. The senators requested written responses so Congress can assess the full extent of the access and any resulting threats to federal payment systems.