There are an estimated 200,000 probationary workers — generally employees who have less than a year on the job — across federal agencies.

The Trump administration must halt its firings of thousands of government employees who have been hired in the past two years, dismissals that had no legal justification, a federal judge in San Francisco ruled Thursday.

U.S. District Judge William Alsup instructed the Office of Personnel Management to inform certain federal agencies it had no authority to order the firings of probationary employees. The ruling is