Prince Charles believes the sexual allegations made against his younger brother are an "unsolvable problem."

On Monday, Virginia Giuffre filed a lawsuit alleging sexual abuse by Prince Andrew. This week, the Duke of York was photographed heading to Balmoral Castle where his mother, Queen Elizabeth II, is residing for the rest of the summer.

On Thursday, the U.K. Times reported that the prince, who was joined by his ex-wife Sarah Ferguson, is "locked in long-distance talks" with his attorneys "as they draw up their strategy for fighting the suit."

A source told the outlet that Charles, who is first in line to the throne, is concerned about how Andrew’s ongoing scandals will impact the monarchy’s future.

PRINCESS EUGENIE JOINS PRINCE ANDREW, SARAH FERGUSON AT BALMORAL CASTLE AMID LAWSUIT FILED BY VIRGINIA GIUFFRE

Prince Andrew Prince Charles

Prince Charles (right) is allegedly worried about how the scandals surrounding his younger brother Prince Andrew (left) will impact the monarchy.  (Photo by Max Mumby/Indigo/Getty Images)

"The prince loves his brother and has the ability to have sympathy for the slings and arrows that his brother endures, whatever the reasons may be," said the palace insider. "His ability to support and feel for those having a tough time is well known."

"However, this will be unwelcome reputational damage to the institution," the source continued. "He has long ago concluded that it is probably an unsolvable problem. This will probably further strengthen in the prince’s mind that a way back for the duke is demonstrably not possible, because the spectre of this [accusation] raises its head with hideous regularity."

According to the outlet, while Andrew stepped back from all 230 of his charities back in November 2019, he was allegedly hoping to return to a public role at some point. He was allegedly eager to start as early as February of this year.

"This is a reminder that that would be very difficult to achieve," the source told the outlet.

PRINCE ANDREW, SARAH FERGUSON PHOTOGRAPHED AT BALMORAL CASTLE AMID LAWSUIT FILED BY ACCUSER VIRGINIA GIUFFRE

Prince of Wales

Prince Charles is first in line to the throne. (Getty Images     )

Attorneys for Giuffre filed the lawsuit in Manhattan federal court, where Jeffrey Epstein was charged criminally with sex trafficking a month before he killed himself at age 66 in August 2019. At the time, the American financier was in an adjacent federal jail where he was ordered to await trial.

Giuffre previously made waves when she went public with her accusations against the Duke of York, alleging the British royal abused her when she was under 18 including at Epstein’s Manhattan home.

The 38-year-old has repeatedly made her allegations against Epstein, his onetime girlfriend Ghislaine Maxwell, and Andrew, but the lawsuit was the first time she has directly confronted the queen's son in such a formal setting.

The case alleges that Andrew engaged in sexual acts without her consent, knowing how old she was and "that she was a sex-trafficking victim," the BBC reported on Tuesday. The case noted that the "extreme and outrageous conduct" continues to cause Giuffre "significant emotional and psychological distress and harm."

PRINCE ANDREW SUED IN FEDERAL COURT BY JEFFREY EPSTEIN ACCUSER VIRGINIA GIUFFRE: ‘I WAS TRAFFICKED TO HIM’

Virginia Roberts Giuffre

Virginia Giuffre holds a photo of herself at age 16, when she says Palm Beach multimillionaire Jeffrey Epstein began abusing her sexually. (Emily Michot/Miami Herald/Tribune News Service via Getty Images)

"In this country no person, whether president or prince, is above the law, and no person, no matter how powerless or vulnerable, can be deprived of the law's protection," the documents read, as quoted by the outlet.

"Twenty years ago Prince Andrew's wealth, power, position, and connections enabled him to abuse a frightened, vulnerable child with no one there to protect her," the documents continued. "It is long past the time for him to be held to account."

In a statement sent to Fox News, Giuffre said she wanted to hold Andrew "accountable."

"Today my attorney filed suit against Prince Andrew for sexual abuse under the Child Victims Act," wrote Giuffre. "As the suit lays out in detail, I was trafficked to him and sexually abused by him."

PRINCE ANDREW ACCUSED OF SEXUAL ABUSE, BATTERY IN LAWSUIT BY ALLEGED EPSTEIN VICTIM VIRGINIA GIUFFRE

Prince Andrew Virginia Roberts

Photo from 2001 that was included in court files shows Prince Andrew with his arm around the waist of 17-year-old Virginia Giuffre who says Jeffrey Epstein paid her to have sex with the prince. Andrew has denied the charges. In the background is Epstein's girlfriend Ghislaine Maxwell.  (U.S. Second Circuit Court of Appeals)

"I am holding Prince Andrew accountable for what he did to me," she shared. "The powerful and rich are not exempt from being held responsible for their actions. I hope that other victims will see that it is possible not to live in silence and fear, but to reclaim one’s life by speaking out and demanding justice."

"I did not come to this decision lightly," Giuffre continued. "As a mother and a wife, my family comes first - and I know that this action will subject me to further attacks by Prince Andrew and his surrogates - but I knew if I did not pursue this action, I would be letting them and victims everywhere down."

A spokesperson for Buckingham Palace didn’t immediately respond to Fox News’ request for comment. The Palace has previously denied the allegations.

"It is emphatically denied that The Duke of York had any form of sexual contact or relationship with Virginia Roberts," they have told Fox News. "Any claim to the contrary is false and without foundation."

PRINCE ANDREW SPENT TIME AT JEFFREY EPSTEIN'S NYC TOWNHOUSE AFTER SARAH FERGUSON DIVORCE, BOOK CLAIMS

Jeffrey Epstein Ghislaine Maxwell

Jeffrey Epstein and Ghislaine Maxwell attend de Grisogono Sponsors The 2005 Wall Street Concert Series Benefitting Wall Street Rising, with a Performance by Rod Stewart at Cipriani Wall Street on March 15, 2005 in New York City.  (Photo by Joe Schildhorn/Patrick McMullan via Getty Images)

The statement continued: "The Duke of York unequivocally regrets his ill-judged association with Jeffrey Epstein. Epstein’s suicide left many unanswered questions, particularly for his victims. The Duke deeply sympathizes with those affected who want some form of closure. It is his hope that, in time, they will be able to rebuild their lives. The Duke is willing to help any appropriate law enforcement agency with their investigations if required.

"The Duke has already stated that he did not see, witness or suspect any behavior of the sort that subsequently led to Jeffrey Epstein’s arrest and conviction. He deplores the exploitation of any human being and would not condone, participate in, or encourage any such behavior."

In late 2019, Andrew told BBC Newsnight that he never had sex with Giuffre, who was known as Virginia Roberts at the time.

"It didn’t happen," he stressed.

SARAH FERGUSON ON EX-HUSBAND PRINCE ANDREW AMID EPSTEIN SCANDAL: ‘I BELIEVE THAT HE’S A KIND, GOOD MAN’

Prince Andrew Jeffrey Epstein

Royal Ascot Race Meeting Thursday - Ladies Day. Prince Andrew, The Duke Of York and Jeffrey Epstein (far right) At Ascot. With them are Edward (far left) and Caroline Stanley (in pink), the Earl and Countess of Derby.  (Photo by Tim Graham Photo Library via Getty Images           )

Andrew also alleged he had "no recollection" of ever meeting her and told an interviewer there are "a number of things that are wrong" about Giuffre’s account, which alleges the encounter occurred in 2001.

"I can absolutely categorically tell you it never happened," Andrew said.

The interview was widely panned by critics who said Andrew seemed insensitive to Epstein’s victims. Afterward, the prince stepped back from royal duties and has attempted to keep a low profile.

Giuffre has long said Maxwell, 59, recruited her at age 17 to be sexually abused by Epstein and Maxwell from 1999 to 2002.

PRINCE CHARLES ASSUMES PRINCE ANDREW'S FORMER ROYAL PATRONAGE AMID EPSTEIN SCANDAL

Prince Andrew Scandal

Prince Andrew is currently at Balmoral Castle where his mother Queen Elizabeth II is residing for the rest of the summer. (Reuters/Neil Hall         )

According to the lawsuit, which sought unspecified compensatory and punitive damages, the prince abused Giuffre on multiple occasions when she was under the age of 18. During each of the alleged acts, Giuffre was given "express or implied threats" by Epstein, Maxwell, and/or Andrew to engage in sexual acts with the prince, the lawsuit said.

It said that she "feared death or physical injury to herself or another and other repercussions for disobeying" the trio because of their "powerful connections, wealth, and authority."

It also said that on one occasion, the prince sexually abused her in Maxwell’s London home when Epstein, Maxwell and Prince Andrew forced her to have sexual intercourse with the prince against her will.

On another occasion, the prince sexually abused Giuffre in Epstein’s New York mansion when Maxwell forced Giuffre and another victim to sit on Andrew’s lap as he touched her, the lawsuit said.

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Virginia Roberts Prince Andrew

David Boies, representing several of Jeffrey Epstein's alleged victims, center, arrives with Annie Farmer, right, and Virginia Giuffre, alleged victims of Jeffrey Epstein, second left, at federal court in New York, U.S., on Tuesday, Aug. 27, 2019. Epstein, a convicted pedophile, killed himself in prison earlier this month while awaiting trial on charges of conspiracy and trafficking minors for sex.  (Photographer: Mark Kauzlarich/Bloomberg via Getty Images)

The lawsuit alleged that Andrew sexually abused Giuffre on Epstein’s private island in the U.S. Virgin Islands. Andrew knew her age at the time based on communications with Epstein and Maxwell, the lawsuit added. It said he went ahead anyway "for the purpose of gratifying his sexual desires."

The lawsuit was brought under the Child Victims Act, a 2019 New York state law that allows victims to temporarily make legal claims of abuse that occurred when they were children regardless of when or how long ago the alleged abuse occurred.

Maxwell has pleaded not guilty to sex trafficking charges in Manhattan federal court, where she faces trial in November. She is held without bail. Her lawyers did not respond to requests for comment.

As part of a continuing probe into Epstein and his encounters with women and teenage girls, Manhattan federal prosecutors last year formally requested to speak with Andrew. The request, similar to issuing a subpoena, was made under the Mutual Legal Assistance Treaty, an agreement between the two countries to share evidence and information in criminal cases. U.S. prosecutors reportedly made a formal request through the British government to interview Andrew.

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American financier and convicted Jeffrey Epstein was found dead on August 10, 2019.

American financier and convicted Jeffrey Epstein was found dead on August 10, 2019. (New York State Sex Offender Registry via AP)

Brad Edwards, a lawyer who represents dozens of Epstein victims, has said that the prince has failed to answer questions for civil lawsuits before.

"I’ve always been given the impression that, whether he has immunity or not, he certainly behaves like he does," Edwards said.

The Associated Press contributed to this report.