U.S. District Judge Amy Berman Jackson ruled on Saturday that Office of Special Counsel head Hampton Dellinger can remain in his role after President Donald Trump tried to terminate him without clear cause.

A federal judge said that the president’s efforts to remove Hampton Dellinger, who leads the Office of Special Counsel, were unlawful. The agency protects whistle-blowers.

A federal judge ruled Saturday that the head of a government watchdog agency whom President Donald Trump is attempting to fire is entitled to remain in the post, setting up a dispute that will almost certainly be decided by the Supreme Court.