[Ammi]

Originally Posted by Niamh.

I have no idea, presumably if he were a "normal" British citizen the US would ask to have him extradited but I don't know about a member of the Royal family, don't they have some sort of diplomatic immunity? I'm really unsure how it would work

...I just saw this as part of an article...

Antonios Tzanakopoulos, associate professor of Public International Law at Oxford University, told CNN that a US court "can always issue a subpoena" but they cannot make someone comply if they are in another jurisdiction, including the UK.
Allred told the BBC that lawyers in the civil lawsuit could seek to subpoena Prince Andrew if he were to travel to the US. "Certainly, if he ever came back to the United States, that would be one of the first things that I'm sure a lot of lawyers, including me, would want to do," she said.
If he were to travel to the US on an official visit, it is likely he would have some form of immunity, although it might be different if he were on a private visit, added Tzanakopoulos.