Prince Harry cannot lose his title and his dukedom as the Duke of Sussex as it is his birthright, an expert said.

Amid calls for Queen Elizabeth to take away her grandson's title, royal commentator Robert Jobson said that the clamor looks "petty and vindictive."

In an interview with Insider, Jobson said that it was the Queen's choice to honor Harry with the dukedom when he got married to Meghan Markle in 2018. Regardless of his choices today, Jobson said that he is still the son of the heir to the throne and "will always be a prince." 

Harry is also still the sixth in line to British throne after his nephew, two-year-old Prince Louis. That hasn't changed even as he and the Duchess of Sussex declared their independence from the royal family early this year. 

Katie Nicholl, another royal expert, said that it is Prince Harry's birthright to keep his title. She doesn't believe that the Queen will revoke her grandson's dukedom because of his decision to go commercial with his multimillion deals with Netflix or the Harry Walker Agency.

Dr. Shola Mos-Shogbamimu, a British lawyer and activist, said that urging the Queen to strip the Sussexes off their royal titles is a double standard when some members of the royal family also gain commercially from their status. While she didn't elaborate, her followers on Twitter cited Sarah Ferguson, the Duchess of York, who has numerous commercial activities. Even Queen Elizabeth went commercial when she allowed drive-in movies in Sandringham Palace. 

Presenter Piers Morgan was one of the first critics to publicly ask the Queen to take away Prince Harry and Meghan's titles. He said on his show Good Morning Britain that the couple should not be allowed to use Duke and Duchess of Sussex anymore if they are going to work in Hollywood.

Politician Susan Hall also said that the Sussexes need to lose all of their titles are they are an "embarrassment to the Crown." A poll from the British tabloid Daily Express revealed that 98 percent of the respondents agreed with Hall and Morgan's call.

In January, Buckingham Palace announced that the only title Harry and Meghan will lose as they become non-working members are the royal family is the His/Her Royal Highness (HRH). Following this statement, Harry told an audience during a speech at one of his last public events in the U.K. that he's fine if people will simply refer to his as "Harry."

What hurt the Duke of Sussex, however, was when Queen Elizabeth stripped her grandson of his military distinctions. In the book Finding Freedom, authors Omid Scobie and Carolyn Durand talked to sources who said that Harry was demoralized when told he will no longer have to perform his military duties or wear his medals and uniforms.