When Prince Harry stepped down as a senior royal, he left his life in the UK behind to start a new life in the US with wife Meghan Markle.
And his departure means he might not be able to carry out a royal role that is only reserved for those at the top of the line of succession.
Currently, Harry along with Prince Charles, Prince William and Prince Andrew are Counsellors of State, which means they can step in if the Queen is unable to perform her duties "due to illness or absence abroad". By law, Counsellors of State are the top four people in the line of succession who are over the age of 21.
But according to constitutional experts, due to Harry now residing in California, he would be unable to step up to the role if he was ever needed - and if more counsellors were to be appointed, the role could fall to Princess Beatrice.
Vernon Bogdanor, author of Monarchy And The Constitution and professor of government at King’s College London, told the Mail on Sunday : "A Counsellor not domiciled in the UK cannot act, so that excludes Harry. The next in line and over the required age of 21 would be Princess Beatrice."
However, reports have suggested that rather than Beatrice, it could be the Duchess of Cornwall who could be appointed a Counsellor of State, if more were needed.
In fact, Camilla will become a Counsellor of State anyway when her husband Prince Charles ascends the throne.
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Dr Craig Prescott, a constitutional expert at Bangor University also told the Mail on Sunday: "The Queen may look to add the Duchess of Cornwall, who would become a Counsellor of State when Charles is King anyway.
"Or they could go down the line to Princesses Beatrice or Eugenie, or add more members of the family, like Princess Anne or Prince Edward to the list."
Buckingham Palace declined to comment on the claims.
Last week, the Palace announced that the Queen will "rest for at least the next two weeks" following an overnight stay in hospital two weeks ago.
The statement added: "The doctors have advised that Her Majesty can continue to undertake light, desk-based duties during this time, including some virtual audiences, but not to undertake any official visits.
"Her Majesty regrets that this means she will be unable to attend the Festival of Remembrance on Saturday, November 13.
"However, it remains The Queen's firm intention to be present for the National Service of Remembrance on Remembrance Sunday, on November 14."
The Queen has been seen in public since the announcement as on Monday she was spotted driving her car around the Windsor estate.
She's also carried out several virtual engagements including presenting a Gold Medal for Poetry to English poet David Constantine and holding virtual audiences with ambassadors from the Republic of Korea and the Swiss Federation.
