Republic — the U.K. anti-monarchy group that launched a private investigation into Andrew Mountbatten Windsor in October — is now demanding a probe of King Charles III and Prince William.

“Republic has called for an inquiry that throws a spotlight on the royal household, its secrecy, spending, influence and any allegations and accusations that have arisen in the past two decades,” the group said in a press release posted on Monday, February 23, four days after the former prince, 66, was arrested under suspicion of misconduct in public office related to his communications with late convicted sex offender Jeffrey Epstein during his role as a trade envoy.

The organization claimed that authorities undertook the historic action because of a crime report sent to the Thames Valley Police by Republic’s CEO Graham Smith.

“This scandal is not just about Andrew, it is about a culture that has allowed the royals to do as they please, knowing there was little chance of repercussions. For that impunity victims of Epstein have likely paid a high price,” Smith said in the release.

“Andrew spent his life surrounded by police, civil servants, royal staffers, his family and politicians,” he continued. “If allegations are true, how could that have carried on for more than two decades without anyone knowing.”

“There must be a reckoning for all those who knew about Andrew and other scandals and misdeed and did nothing,” he added. “There must be a full inquiry into the royal household and the culture of impunity that has surrounded it.”

To that end, Smith said in another press release, issued on February 19, that Charles, 77, and William, 43, should make themselves available for public questioning.

“The silence from the Palace is deafening,” Smith said.

“Charles and William need to speak up,” he added in another February 19 statement, “and admit to whatever they have known, when and why they continued to protect Andrew.”

“I have learned with the deepest concern the news about Andrew Mountbatten-Windsor and suspicion of misconduct in public office,” the king said in a statement released to People on the day of his brother’s arrest.

“What now follows is the full, fair and proper process by which this issue is investigated in the appropriate manner and by the appropriate authorities. In this, as I have said before, they have our full and wholehearted support and co-operation. Let me state clearly: the law must take its course. As this process continues, it would not be right for me to comment further on this matter. Meanwhile, my family and I will continue in our duty and service to you all.”

If Andrew, who has repeatedly denied any wrongdoing, is charged and convicted, he could face life in prison.