TREASURER Scott Morrison fired a fervid warning across the Cabinet table that Malcolm Turnbull’s plan to end the dual citizenship debacle could end them all – a prediction many in the Government now feel is inevitable.

The leak – the third serious betrayal of Cabinet confidentiality in as many months – for the first time embroils the Treasurer and raises questions about loyalties within the Turnbull Government.

In the past few months The Courier-Mail has revealed Attorney-General George Brandis used a technical legal argument against introducing world-first laws from stopping pedophiles from travelling overseas, and that Cabinet had strongly rejected the Referendum Council’s “radical” blueprint to recognise indigenous Australians in the Constitution.

As the Prime Minister and Opposition Leader Bill Shorten failed to reach a compromise yesterday on a mandatory family tree disclosure, new details can be revealed about Monday’s Cabinet meeting.

Highly placed sources say Mr Morrison stated “I want to win the next election”, arguing the PM’s blueprint could be an own goal.

However, Mr Morrison’s criticisms were drowned out by those who said they “needed to do the right thing”, while questioning what the alternative option was.

It is understood Mr Turnbull had the backing of the room on Monday and Cabinet then signed-off on the draft resolution, which would give Parliamentarians 21 days to submit documents stating where their parents were born and to their knowledge that they were not dual citizens.

Mr Morrison is said to be frustrated by the Government’s inability to unshackle itself from the dual citizenship saga and wants to talk about real issues affecting voters, like cost of living pressures.

When asked about the matter yesterday, Mr Morrison’s spokesman said, “the Treasurer supports the Prime Minister’s resolution measure, as reached by cabinet”.

Yesterday, Mr Morrison was publicly backing-in Mr Turnbull’s plan.

“I think the Prime Minister has put forward a very commonsense proposal to deal with an issue that is not of the Government’s making (and) ... what we must be careful of is not to be distracted by this,’’ Mr Morrison said.

“Who people’s parents or grandparents are is not the reason that we need to act on petrol prices and electricity prices or on any of the issues that are affecting households across the country.”

After a two-hour meeting yesterday, Mr Shorten refused to sign-off on the declaration blueprint, saying it should be done sooner, be extended to grandparents and based on proof and not belief.

Some sources spoken to by The Courier-Mail since the Cabinet meeting say they feel they have already lost the election, and are ready for a number of Coalition MPs and Senators to be referred to the High Court and kill their majority – and possibly send them to Opposition trenches.

However, they are also real questions over at least two Labor MPs – Tasmanian Justine Keay and Queensland’s Susan Lamb – and face being referred to the High Court by Parliament by the end of the year if Mr Turnbull’s plan is successful.

It comes as Special Minister of State Scott Ryan has put up his hand to run as President of the Senate, meaning he would create a ministerial vacancy.

It has re-sparked speculation a reshuffle will happen by the end of the year.