MPs will be given carte blanche to discuss Andrew Mountbatten-Windsor and his relationship with paedophile Jeffrey Epstein in the House of Commons.
Speaker Sir Lindsay Hoyle is expected to allow MPs to discuss the King's brother in a debate as he is no longer regarded as an active member of the Royal Family.
Under long-established convention set out in Erskine May - the parliamentary rulebook - MPs have traditionally been discouraged from discussing the monarchy in the Commons chamber.
However Andrew will now be fair game as he was stripped of his prince and Duke of York titles last year after emails emerged that cast doubts over previous claims about when he cut ties with Epstein.
But despite this MPs will be reminded that they should refrain from discussing other members of the Royal Family, including the King and Andrew's daughters, Princesses Beatrice and Eugenie.
The Speaker is also likely to advise MPs they should be mindful not to say something that might prejudice any legal proceedings, as the House's sub judice rule prohibits reference to active cases and discussions of ongoing police investigations are discouraged.
It comes after Andrew was arrested last Thursday on suspicion of misconduct in public office and released under investigation for allegedly leaking confidential information to Epstein while serving as the UK's trade envoy. He has always denied wrongdoing.
MPs across parties are preparing to press for answers over how he was able to represent the nation for a decade with seemingly minimal oversight, despite concerns over his questionable friendships.
The House of Commons Speaker Sir Lindsay Hoyle (pictured) is expected to allow MPs to discuss the King's brother in a debate as he is no longer regarded as an active member of the Royal Family
Under parliamentary rulebook Erskine May MPs have traditionally been discouraged from discussing the monarchy in the Commons chamber. However Andrew will now be fair game as he was stripped of his prince and Duke of York titles last year
The Liberal Democrats are considering using an opposition day debate on Tuesday to force a debate to further scrutinise Andrew's former trade envoy role.
And on Monday Conservative leader Kemi Badenoch called for the Department for Business and Trade to open its files on Andrew to aid the investigation.
She said: 'Prince Andrew would have been given that because it could open doors, but if there is anything in these allegations of misconduct in public office, then all the files should be released and investigated.'
A Lib Dem source said the party is considering using the debate to 'secure more transparency and parliamentary scrutiny' around Andrew's taxpayer-funded role. It is understood that the party is still in discussions with Commons clerks on the exact details of the motion.
A spokesman said: 'There are major questions the Government needs to answer over Andrew Mountbatten-Windsor's role as trade envoy, and how he was seemingly able to act with impunity. The Liberal Democrats will be using our Opposition Day to force this debate into the open.
'Parliament cannot be expected to look the other way. We must be able to debate this fully without fear or favour, while not prejudicing the ongoing police investigation.
'The public deserves full transparency over this scandal, so we can hold the powerful to account and rebuild public trust in our institutions.'
Andrew's downfall has triggered renewed calls for greater transparency around the Royal Family, which remains largely exempt from Freedom of Information laws and wider scrutiny by Parliament.
Education Secretary Bridget Phillipson on Sunday refused to rule out a judge-led inquiry into the former duke. 'We do believe all options should be open for consideration. This is extremely serious,' she told GB News.
Any independent inquiry would be designed to establish the facts of Andrew's links with Epstein, as well as the wider issues or failures in his position as trade envoy.
It comes after The Mail on Sunday revealed that the King was warned that the family name was being 'abused' by Andrew's contacts.
In a bombshell email, a whistleblower told the Palace as long ago as 2019 that Andrew had secret financial links to controversial millionaire financier David Rowland, who was exploiting his royal links.
