Imagine the following hypothetical: a U.S. president, while
in office, sneaks out of the White House in a tunnel, walks a few blocks
further, and shoots a passerby in the head. The president returns to the White
House as if the incident had not occurred. The only hint of the murder lies in
the pardon that he gives himself for any crimes committed while in office. Would
such a president be on solid legal grounds?
The full essay is at "Not above the Law"