US President Donald Trump and Britain's Prime Minister Theresa May sit at the start of the retreat meeting on the first day of the G-20 summit in Hamburg, northern Germany, on Friday July 7, 2017.

© AP Photo/ John MacDougall

Other people not included in the guest list for the wedding, which is to take place on May 19, is current US President Donald Trump and his predecessor Barack Obama, the Telegraph reported, citing government sources.

The reason behind the failure to invite the country’s Prime Minister has been explained quite simply: Prince Harry and Meghan Markle will not have an official list of political leaders on their guest list.

“It has been decided that an official list of political leaders — both UK and international — is not required for Prince Harry and Ms. Markle’s wedding…Her Majesty’s Government was consulted on this decision, which was taken by The Royal Household,” a Kensington Palace spokesman stated as quoted by the media.

​As the newspaper explained, the guest list will be quite restricted — including only those having a direct relationship with the couple. The limitation is connected two factors: with the size of St George’s Chapel, which is quite small and the fact that the prince is not in the direct line of succession.

​It also explains the invitations to wait on the grounds outside the chapel to watch the bride and groom and their wedding guests arrive and leave, received by some members of the public, as reported by the Telegraph.

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Some members of the public have received an invitation to wait in the grounds outside the chapel to watch the bride and groom and their wedding guests arrive and leave.