It can be Republican or Democrat, or unaffiliated. Black, white, male, female, ... it does not matter. Who do you think would be a good leader that people would support and stand behind?
It should be someone with leadership skills, a good understanding of science and world politics. Someone who naturally commands respect and knows how to work with others. And that person must be scandal free.
Personally, I’d like it to be someone who regularly reads “The Economist”.

Look who’s in the position now. Who would you like to see replace him?

I’d like Colin Powell. or even Bill Gates.