A senior U.S. lawmaker says representatives of Elon Musk were granted “full access” to a U.S. Treasury payments system used to disperse trillions of dollars to Americans each year, and warned that Musk’s access to the system poses a “national security risk.”

The U.S. Agency for International Development’s director of security and his deputy were placed on administrative leave Saturday after they tried to prevent employees from the Department of Government Efficiency from accessing secure USAID systems,