You know. That’s actually an interesting hypothetical. How does the Secret Service react if two people with Secret Service protection try to fight each other? I imagine they would first protect whoever has the most seniority, as in the current serving president, then current vice president, etc. But what if say, two former presidents try to duke it out?
Or can the president waive Secret Service protection? Since the president has broad immunity for ‘official acts’, does this mean the president can now duel someone on the White House Lawn at dawn?