A US judge will hear an appeal from a conservative think tank which argues that the Duke of Sussex's visa application should be made public following revelations of past drug use.
The federal court hearing will take place in Washington DC on Tuesday and will be open to media.
Prince Harry wrote of using marijuana, cocaine and psychedelic mushrooms in his memoir Spare, which was released in January.
This is significant because past drug use may be considered grounds to deny a US visa application, although in reality the situation is more complex.
The US hearing is separate from the UK trial involving Prince Harry and alleged phone hacking by newspapers.
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