A federal judge in San Francisco on Thursday found that the mass firings of probationary employees were likely unlawful, granting some temporary relief to a coalition of labor unions and organizations that has sued to stop the Trump administration’s massive trimming of the federal workforce.

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

A federal judge ruled Saturday that President Donald Trump’s firing of a federal workforce watchdog was illegal — teeing up a Supreme Court showdown over the president’s claim to nearly absolute control of the executive branch.