"In the building behind me, Elon Musk is seizing power away from the American people," Warren told hundreds gathered outside the Treasury. The show of protest came as Democrats in Congress are struggling,

Elon Musk and his Department of Government Efficiency have been granted access to a sensitive Treasury Department payment system containing personal data of millions of Americans receiving tax refunds,

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