As Prince Harry faces defeat in one of his legal battles, a royal pundit called him out for his alleged "addiction to litigation."

Mr. Justice Nicklin recently ordered the Duke of Sussex to pay the legal costs incurred by the Associated Newspapers, the publisher of Daily Mail, after he failed in his bid to have the case decided without a trial. The judge said the legal costs would need to be assessed, but the royal should pay $60,000 (£48,447) on account on Dec. 29.

Royal pundit and author Lady Colin Campbell appeared on GB News and spoke about the issue. According to her, Meghan Markle's husband is a "vexatious litigant."

"Harry needs to not only cut his losses with this case, but with his attitude to the press," Campbell told the outlet. "Harry has an addiction to litigation. That is a legal category called vexatious litigant."

Campbell recalled Prince Harry's "anti-free speech" and pointed out how he called the First Amendment "bonkers." She then offered unsolicited advice that the duke should seek treatment. Additionally, she urged Prince Harry to grow up and behave and act like a prince.

"Harry needs to go into treatment and realize it's one thing if the press defames you, it's quite another thing to scratch around looking for all sorts of things trying to attack a free press when you are supporting the right to a press to be free," she added.

TalkTV's Vanessa Feltz and royal expert and royal editor Sarah Hewson also discussed the same issue. During the conversation, Feltz mentioned that it was unusual for royal family members to appear in court or bring legal cases in such "regularity" as Prince Harry did.

"He seems almost to like it to relish and to want to do it," Feltz said about Prince Harry's legal cases.

"Sometimes, it's hard to keep up with these cases," Hewson agreed.

"There are five different proceedings taking place involving Prince Harry at the moment. There is a libel case against The Mail on Sunday, there are three privacy cases against different newspaper groups as well on top of that, his case against the Home Office about the removal of his home security," she added.

Historian and broadcaster Rafe Heydel-Mankoo criticized Prince Harry's legal battle against the Royal and VIP Executive Committee (RAVEC). He sued, claiming that he was unfairly stripped of his publicly funded security after he stepped back from his royal duties. RAVEC decided not to provide Prince Harry 24/7 protection but would still protect him on a "case by case" basis, depending on its assessment of threat level.

"This is all complete nonsense, actually, because he is getting protection," Heydel-Mankoo said. "If he comes to attend royal events, he will receive royal protection. They have bespoke protection plans for him, depending upon his needs."

Prince Harry sued the Daily Mail for a report about his police protection. The headline of the article in question read, "How Prince Harry tried to keep his legal fight with the government over police bodyguards a SECRET... then -- just minutes after the story broke -- his PR machine tried to put a positive spin on the dispute."

He argued that it was libelous because he felt it attacked his integrity. Prince Harry's libel case against the Daily Mail will go to trial in the spring or summer next year.