A federal judge has blocked Elon Musk's so-called Department of Government Efficiency from accessing Treasury Department records that contain sensitive personal data such as Social Security and bank account numbers for millions of Americans.

A federal judge on Friday declined to block Elon Musk's government cost-cutting department from accessing the U.S. Department of Labor's systems, an initial setback for the government employee unions resisting his efforts to shrink the federal bureaucracy.

A federal judge has denied an effort to block the Department of Government Efficiency from accessing sensitive data from the Department of Labor.