President Donald Trump is heading to the Supreme Court for the first time in his second term, using an emergency appeal to call on the justices to let him fire the head of a government ethics watchdog agency.

The U.S. Supreme Court has allowed presidential power to steadily expand in recent decades. Now the court may review Trump administration efforts to expand executive branch authority.

The Supreme Court could rule as early as this week on whether Special Counsel Hampton Dellinger should be reinstated and given access to his office, the first legal clash to reach the justices during this Trump administration over congressional protections for some federal officials.