Before a ruling was made in the case, Mr Trump raged at the Biden administration for maintaining the privacy of Harry’s immigration application in order to “protect Harry.” He told the Express US: “I wouldn’t protect him. He betrayed the Queen. That’s unforgivable. He would be on his own if it was down to me.”

Days later he was also challenged on this stance on Harry during an interview with Nigel Farage on GB News. Mr Farage asked if there would be any “special privileges” for the prince, and the Republican candidate said: “No. We’ll have to see if they know something about the drugs, and if he lied they’ll have to take appropriate action.”

Digging deeper, Mr Farage asked: “Appropriate action? Which might mean…not staying in America?” Mr Trump responded: “Oh I don’t know. You’ll have to tell me. You just have to tell me. You would have thought they would have known this a long time ago.”

Last month, a judge made a ruling in the case saying that Harry’s visa documents should remain private. However, the Heritage Foundation has made another court filing saying it was not granted access to private submissions made to the judge by the Biden administration.

The 13-page motion was filed last Tuesday and says that the case was ‘unique’ and complex but adds there is “ample evidence of agency bad faith” meaning this “severely compromises [Heritage’s] ability to prepare arguments on appeal”.

The lawsuit was originally brought by the Heritage Foundation after a Freedom of Information request for the Duke’s records was rejected by the Department for Homeland Security (DHS). In his bombshell memoir, Harry confessed that cocaine “didn’t do anything for me”, adding: “Marijuana is different, that actually really did help me.” He also recounts an experience with magic mushrooms, saying: “I stared at the bin. It stared back. ‘What-staring? ‘ Then it became… a head. I stepped on the pedal and the head opened its mouth. A huge open grin.”

US visa applications specifically ask the individual about current and past drug use, which can have a detrimental impact on the progress of the application. Prolific drug use can lead to applications being rejected, however, immigration officers use their discretion against a range of factors.

However, there has been a hint that Harry’s visa woes if there’s a Trump presidency won’t result in him being deported. It comes after Mr Trump’s son Eric suggested Harry’s visa would be safe because “no one cares” about him and that his wife Meghan is “pretty unpopular”.

Speaking to MailOnline, Eric said: “Truthfully I don’t give a damn about Prince Harry and I don’t think this country does either. My father loved the Queen and I think the monarchy is an incredibly beautiful thing.” He added: “I don’t give a damn if he did drugs. It means nothing. I can tell you that our father and our entire family has tremendous respect for the monarchy.”

Elsewhere in the interview, he said Harry had appeared to have “gone off the deep end and it’s sad to watch” but praised his brother Prince William and added that his wife Kate has been “such a rock in the next generation of the family”.