Or at all? There is literally no function for an absolute or constitutional monarch in our current system, or, in fact, through most of the industrial world. If you're worried about a one person gaining absolute power, there are other avenues that actually exist within a republican system where a political strongman can consolidate power. Even in banana republics, strongmen who gain power through military might (kings were derivative of prestate warlords) rarely crown themselves as monarchs because political systems are no longer built around a centralized position.