In a unique twist on international law, Pope Leo XIV, a lifelong American citizen, is also the head of the Vatican City, a sovereign nation. This unusual dual citizenship raises questions about the ability of an American to lead a foreign state. While U.S. law permits dual citizenship, complexities arise for foreign heads of state aiming to maintain their American nationality. For instance, the State Department has clarified that dual nationalities can exist, and it reviews cases where foreign leaders wish to keep their American citizenship.

Historically, popes have retained their native citizenships. For instance, Pope Francis kept his Argentine nationality and renewed his passport in 2017. Such policies suggest that Pope Leo could, theoretically, maintain both his American and Vatican citizenships. However, concerns about legal implications may linger for those in power.

An interesting side note: Somali ex-president Mohamed Abdullahi Mohamed, also an American citizen, resigned his U.S. citizenship before taking office due to suspected dual allegiances. While the Holy See maintains its distinctive governance as a recognized observer in the United Nations—steering clear of political bias—Pope Leo's situation brings attention to the complexities and considerations surrounding dual citizenship in global leadership roles. The State Department and Vatican remain tight-lipped on Pope Leo's future moves, keeping everyone guessing.