Prince Harry and Meghan Markle are worried about the potential consequences Donald Trump's possible reelection could have on the Duke of Sussex's residency status, a royal expert has claimed.

Prince Harry's immigration status is at the center of an ongoing legal battle stemming from his admission of past drug use in his 2023 memoir, "Spare."

Trump -- whose lead over President Joe Biden in the 2024 White House race has grown since their June debate -- has repeatedly hit out at Prince Harry and Markle and hinted at potentially deporting the duke if he is found to have lied about his drug use on his U.S. visa paperwork.

Speaking to the Mirror U.K., royal author Tom Quinn claimed that Prince Harry now "deeply regrets" making his history of taking illegal drugs public.

Prince Harry
Prince Harry, Duke of Sussex arrives for the Coronation of King Charles III and Queen Camilla at Westminster Abbey on May 6, 2023 in London, England. Andy Stenning - WPA Pool/Getty Images

According to Quinn, the Duke and Duchess of Sussex allegedly have sought advice from lawyers over fears that Trump could have the prince's visa revoked if he secures a second term in office. Enstarz could not independently verify this information.

"The couple have taken legal advice because they're seriously worried that if Donald Trump wins the next election Harry's visa may be revoked. Trump has insisted that if Harry is found to have lied on his visa application about his admitted drug taking, he could be asked to leave the country," the royal expert told the outlet.

Quinn went on to claim that Prince Harry "initially thought this couldn't possibly happen to him as the normal rules don't apply to a royal prince."

Prince Harry
Britain's Prince Harry, Duke of Sussex waves as he arrives to attend a ceremony marking the 10th anniversary of the Invictus Games, at St Paul's Cathedral in central London, on May 8, 2024. JUSTIN TALLIS/AFP via Getty Images

However, the "Scandals of the Royal Palaces" author claimed that the former military pilot is "increasingly realizing that in the United States being a prince doesn't actually count for very much."

"But one thing is for sure: Harry deeply regrets ever making his drug-taking public. It never occurred to him that this might end up threatening his whole life plan," Quinn added.

In his book "Spare," Prince Harry wrote about his experience taking cocaine, cannabis, and psychedelic mushrooms in the past.

Conservative think tank The Heritage Foundation is now suing the U.S. government after its initial request to access Prince Harry's immigration file was rejected.

The think tank said it wants to know if his past drug use -- which can be grounds for a visa application rejection -- was disclosed in Prince Harry's paperwork before he entered the U.S.

Prince Harry and Meghan Markle
 Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex attend the Your Commonwealth Youth Challenge reception at Marlborough House on July 05, 2018 in London, England. Yui Mok - WPA Pool/Getty Images

Back in February, Trump accused the Biden administration of protecting Prince Harry and giving him special privileges.

"He betrayed the Queen. That's unforgivable. He would be on his own if it was down to me," Trump told Express of Prince Harry.

The following month, the Republican presidential candidate told GB News host Nigel Farage that he would not give the Duke of Sussex any special privileges and would take "appropriate action" against Prince Harry if it emerged that he lied about his drug use in his visa application.

Asked if he meant deportation, 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."

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Prince Harry, Donald trump