My question is, who would have the legal authority to arrest the Pope? Jurisdiction etc...
interesting times indeed!
Legal authority at the Vatican:
Corps of Gendarmerie of Vatican City - Wikipedia
https://en.wikipedia.org/wiki/Law_enforcement_in_Vatican_City
The Gendarmerie Corps of Vatican City State (Italian: Corpo della Gendarmeria dello Stato della Città del Vaticano) is the gendarmerie, or police and security force, of Vatican City and the extraterritorial properties of the Holy See. It was founded in 1816 as Corps of Gendarmes by Pope Pius VII, renamed the Central Security Office in 1970, the Security Corps in 1991, and was restored to its original name in 2002.
National agency: Vatican City State
Formed: 1816
Operations jurisdiction: Vatican City State
Motto: Fides et Virtus, Faith and courage
Very good point. The Pope is a head of state. As much as I'd like to see that commie fraud behind bars I'm not holding my breath.