Senator Elizabeth Warren is sounding the alarm over a decision that could give tech billionaire Elon Musk a surprising level of control over the government’s purse strings. In a strongly worded letter to Treasury Secretary Scott Bessent, the Massachusetts Democrat expressed deep concerns about Musk’s team being granted access to a crucial federal payment system that manages trillions of dollars in transactions.

This system isn’t just another office tool—it’s vital for things like sending Social Security checks, processing tax refunds, and preventing the U.S. from defaulting on its debt. Warren warned that meddling with it could have serious consequences for millions of Americans.

The senator demanded answers about how Musk’s so-called “Department of Government Efficiency” was given this access, what they plan to do with the data, and what safeguards are in place to protect Americans’ private information. She also questioned why such a sensitive system was handed over to an unelected billionaire and his team of advisers.

This move comes after David Lebryk, a longtime Treasury civil servant, resigned abruptly last Friday following pressure to grant Musk’s representatives access. While sources say Musk’s allies passed background checks and haven’t yet used their access, Warren’s letter highlights growing unease among Democrats about the Trump administration’s unusual partnership with the tech mogul.

As the debate heats up, all eyes are on the Treasury Department to see how they’ll respond to Warren’s concerns—and whether Musk’s team will gain further influence over government spending.