The US Supreme Court declined for now to let President Donald Trump oust the head of a federal whistleblower agency, letting the official stay in the job until at least Wednesday.

President Donald Trump has expounded an extraordinary vision of his authority over the past month, relying on the Supreme Court’s decision last year granting him immunity from criminal prosecution, as a blank check in his broader drive for power.

The filing amounts to a challenge to a foundational precedent that said Congress can limit the president’s power to fire leaders of independent agencies.