The Heritage Foundation wants Harry’s visa application to be made public, claiming that they are of “immense public interest” and show he “lied.”

In February, Donald Trump told Daily Express US that he “will not protect” Harry.

He said: “I wouldn’t protect him. He betrayed the Queen. That’s unforgivable. He would be on his own if it was down to me.”

Trump also told GB News’ Nigel Farage last week: “We’ll have to see if they know something about the drugs, and if he lied they’ll have to take appropriate action.”

Lawyer John Bardo said: “Saying something in a book doesn’t necessarily make it true.

“The Department for Homeland Security has reportedly said it cannot reveal whether his visa application mentioned his drug use.

“The mere acknowledgment of these records would constitute an unwarranted invasion of Prince Harry’s privacy.

“The records are particularly sensitive because releasing them, even in part, would reveal Prince Harry’s status in the United States, which Prince Harry has not disclosed.

“Courts consistently hold that a person’s visa or immigration status is private, personal information exempt from disclosure.”

Harry was also recently asked if he was planning on getting US citizenship.

He told Good Morning America: “The American citizenship is a thought that has crossed my mind but certainly not something that’s a high priority for me right now.”

In court, Harry’s lawyer defended his comments regarding drug use, saying they could have been made to sell more copies of his book.