The Supreme Court on Tuesday blocked a federal judge’s sweeping order requiring the Trump administration to rehire thousands of fired federal employees, marking an early legal win for the president’s plan to slash government bureaucracy.

In a brief, unsigned order, the high court sided with the administration and froze a March 13 injunction from U.S. District Judge William Alsup in San Francisco, who ordered six agencies to reinstate 16,000 recently hired probationary employees pending litigation over the legality of their mass terminations.