Elon Musk said his “DOGE team” of government efficiency enforcers is shutting down some payments to federal contractors, suggesting that the world’s richest man may have access to sensitive systems used at the US Treasury Department.

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

Elon Musk and his nongovernmental team of government spending slashers have been granted access to the U.S. Treasury’s payments system, which is used to disperse trillion of dollars worth of government funds each year.