Serves as a leader: what he says, people will follow. Hence why it’s ludicrous for him to suggest ingesting disinfectant.
Commander in chief: Leads the strategy in military
Appoint ambassadors and chairs of cabinets and departments
Influences policy making by using veto power.
Can initiate trade.
Etc.
People from Latin states, otherwise known as the Latini, could be citizens in Ancient Rome.