New Zealand has joined Australia in backing moves to remove Andrew Mountbatten-Windsor from the royal line of succession.
The Prime Ministers of both Commonwealth realms have said they would support any UK legislation to ensure the former duke can never become king.
A spokesman for New Zealand Prime Minister Christopher Luxon said Wellington would back the British government if it decided to take action.
Australia’s Prime Minister Anthony Albanese has already pledged support for “any proposals” put forward by the UK.
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In a letter sent on Monday, Mr Albanese said Mr Mountbatten-Windsor was facing “grave allegations” and that “Australians take them seriously”.
Speaking on Australian radio, he said Sir Keir Starmer had thanked him for his position and confirmed Canberra would be “writing today to the other realm countries as well, informing them of our position”.
Although stripped of his royal title, Mr Mountbatten-Windsor remains eighth in line to the throne - behind Prince William and his three children, as well as Prince Harry and his two children.
Removing him would require an Act of Parliament and the consent of all 15 Commonwealth realms.
New Zealand has backed calls to remove Andrew Mountbatten-Windsor from the line of succession
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So far, only Australia and New Zealand have publicly endorsed the move.
Downing Street is understood to be preparing legislation once the police investigation into Mr Mountbatten-Windsor’s communications with convicted paedophile financier Jeffrey Epstein concludes.
The former Duke of York was arrested on suspicion of misconduct in public office, accused of sharing sensitive information with Epstein while serving as a trade envoy.
He was later released under investigation and has not been charged.
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Anthony Albanese said the allegations against Mr Mountbatten-Windsor were 'grave'
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A spokesman for New Zealand Prime Minister Christopher Luxon said Wellington would back the British government
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Lord Mandelson was also arrested on suspicion of misconduct in public office and released on bail.
The former US ambassador is accused of passing sensitive information to Epstein during his time as Business Secretary.
Mr Mountbatten-Windsor has denied wrongdoing in relation to Epstein but has not responded directly to the latest allegations.
Lord Mandelson has previously maintained he did not act criminally or for personal gain.
Australia has long had an active republican movement, with the position becoming the official policy of the country's governing Labour Party in 1991.
A 1999 referendum saw 55 per cent vote to remain a constitutional monarchy.
While recent polling shows similar results overall, support for republicanism has grown among younger voters.
Mr Albanese said his government has no plans to hold another referendum despite his personal support for an Australian head of state.
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