One of the largest U.S. labor unions asked a federal judge on Wednesday to block Elon Musk's government cost-cutting effort from accessing the Department of Labor's systems, which the union warned could give the billionaire sensitive information about investigations into his companies.

The systems DOGE has access to include the names, addresses, bank details, and other information about taxpayers and people who receive government benefits.

Musk's rapid takeover of US government agencies has enabled the businessman to exert unprecedented control over America's federal workforce.

The White House said Elon Musk, the billionaire leading President Donald Trump’s government cost-cutting efforts, will determine if there are conflicts of interest between his work reviewing federal spending and his overlapping empire of six companies.

Elon Musk will work under President Donald Trump as a “special government employee,” designating Musk as an unpaid employee of the federal government with fewer restrictions than full-time employees,

Elon Musk's control of a federal payment system is raising concerns about funding for programs like Social Security and the safety of personal data.

The Department of Government Efficiency's alleged access to the Treasury's payment systems has sparked a lawsuit from federal workers' unions.