The U.S. Supreme Court blocked on Tuesday a judge’s order for President Donald Trump’s administration to rehire thousands of fired employees, acting in a dispute over his effort to slash the federal workforce and dismantle parts of the government.

The court put on hold San Francisco-based U.S. Judge William Alsup’s March 13 injunction requiring six federal agencies to reinstate thousands of recently hired probationary employees while litigation challenging the legality of the dismissals continues.