In the latest stage of the sexual assault case against him, Britain's Prince Andrew is expected to argue he has not been served papers, and will challenge the jurisdiction of the case.
Virginia Giuffre has launched a civil case against the Duke - and papers must be served before it can proceed.
A lawyer for the Duke of York, who is 61, was expected to appear in a New York pre-trial court conference call on Monday.
He denies all the allegations against him.
The conference call will consider the next stages of the case, which began last month.
The judge will decide whether papers were in fact served and whether the case can proceed.