The secret service protects current and past presidents.
But what happens if it turns out Biden was never president to begin with? The election was not real. The president was not real.
Does secret service continue to protect?
Could Biden be the first arrest?
The key to this question is "world." It's going to have to be someone who is larger than life and a world-wide figure with a large audience. I doubt it will be a past president. I'm not even sure that Bidan would be much of a shock to the world. The Pope would fit the bill, though, as he is the head of Catholics world-wide and you don't even need to be Catholic to know who he is.