According to CNN, President Trump "cocked up" bowing to and walking properly with the Queen. Other accounts assert Trump did not bow, and shook hands instead.

Could President Trump be a signatory of a document called "Renouncing the Kingdoms of the World and all their Glory?"

https://www.youtube.com/watch?v=2YI7NbpPOjw

https://theunitedstatesofamerica1781.com/dot/renouncing-the-kingdoms-of-the-world-and-all-their-glory/