The Supreme Court has denied an emergency appeal by President Donald Trump seeking to immediately fire Office of Special Counsel chief Hampton Dellinger.

A lawyer for Luigi Mangione, the man accused of fatally gunning down U.S. health insurance executive Brian Thompson in December, told a judge Friday that her client was illegally searched during his arrest and she would seek to exclude that evidence from his trial on state murder and terrorism charges.

The case involves major constitutional questions about presidential power—but its unusual posture could make it a dud.