The move comes after reports that the British government is considering legislation to ensure that Andrew Mountbatten-Windsor, currently eighth in line to the throne, could never become king. This follows his arrest as part of a police investigation into links with disgraced U.S. financier and convicted sex offender Jeffrey Epstein.

Last year, King Charles stripped his brother of the title of prince and removed him from his Windsor residence. As monarch, Charles is head of state not only in Britain but also in Australia and 13 other countries. Any changes to the line of succession must therefore be approved across all these realms.

In his letter to UK Prime Minister Keir Starmer, Australian PM Anthony Albanese said that Australia would support any proposal to remove the king’s younger brother from succession. “I agree with His Majesty that the law must now take its full course and there must be a full, fair, and proper investigation,” he wrote. “These are grave allegations and Australians take them seriously.”

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The last change to the line of succession occurred in 2013, when a law was passed to end a 300-year-old system that gave preference to male heirs.

UK authorities have said any change would follow the completion of ongoing police investigations. Officers are searching Mountbatten-Windsor’s former Windsor mansion as part of a probe into potential misconduct during his time as a government trade envoy.

Additional allegations connected to Jeffrey Epstein are also being examined by various British police forces. Mountbatten-Windsor has not commented publicly since U.S. government documents linking him to Epstein were released last month. He continues to deny any wrongdoing.