The Alliance for Retired Americans, along with two employee unions, sued the Treasury Department to halt Elon Musk, the newly appointed head of the Department of Government Efficiency advisory team, from accessing Treasury’s payment systems.

The Treasury Department was accused of breaking federal law by giving Elon Musk’s team of government efficiency enforcers access to a trove of personal and financial information — setting up a legal showdown over the Trump administration’s signature effort to shrink the government.

President Donald Trump’s administration is being sued over Elon Musk’s alleged “massive and unprecedented” intrusion into the American government’s payment systems. The suit, filed in a Washington, DC federal court Monday evening by the advocacy group Public Citizen,