Who has the real power in this nation?

WASHINGTON (Reuters) -A U.S. judge on Saturday declared President Donald Trump's firing of the head of a federal watchdog agency illegal in an early test of the scope of presidential power likely to be decided at the U.S. Supreme Court.

U.S. District Judge Amy Berman Jackson in Washington had previously ruled Hampton Dellinger, the head of the Office of Special Counsel who is responsible for protecting whistleblowers, could remain in his post pending a ruling.