Sotomayor's dissent [1] is a must-read as well. She's more concerned than you are.
The President of the United States is the
most powerful person in the country, and possibly the
world. When he uses his official powers in any way, under
the majority’s reasoning, he now will be insulated from
criminal prosecution. Orders the Navy’s Seal Team 6 to as-
sassinate a political rival? Immune. Organizes a military
coup to hold onto power? Immune. Takes a bribe in ex-
change for a pardon? Immune. Immune, immune, immune.