In a letter to the Treasury secretary, the Democratic senator warned against meddling with a system that processes trillions of dollars of transactions.

Days after his swearing-in, Treasury Secretary Scott Bessent gave Elon Musk and his team at the so-called Department of Government Efficiency (which despite its name, is not an official government department), access to the agency’s federal payments system, which essentially operates as the country’s central bank account.

DOGE has recently gained access to sensitive Treasury data, including Social Security and Medicare customer payment systems. Some politicians worry this gives Elon Musk too much overreach