The Stormont Assembly could be recalled to approve emergency measures dealing with the overspend on Northern Ireland's botched green energy scheme, the Democratic Unionist Party has claimed.
But a senior Sinn Féin minister said he was "bemused" amid reports a proposal had been drawn up to address the potential £490 million taxpayers' bill.
The Department for the Economy, under the DUP's Simon Hamilton, plans to seek coalition partners Sinn Féin's backing for the move.
Mr Hamilton said: "I hope we would be able to get from my department a paper to the Executive in the next number of days for approval.
"It would be my hope then that we might be able to bring that to the Assembly as early as next week."
But Sinn Féin Finance Minister Máirtín Ó Muilleoir said the DUP had not contacted him.
He added: "I am bemused at the trailing in the media of a DUP plan to resolve the Renewable Heat Incentive (RHI) debacle when not one scrap of paper detailing this 'plan' has been received by the Department of Finance.
"I am alert to the dangers of allowing the person who was the architect of the RHI scheme - the DUP leader - to come up with a solution to this debacle. That is why I will ensure my officials rigorously test any plan which comes from the DUP.
"I will be guided solely by what is in the interest of the public purse.
"The DUP are in a hole and should stop digging."
First Minister Arlene Foster has claimed measures being drawn up by Mr Hamilton could clear Stormont's bill.
"There will be no overspend," she said.
Mr Ó Muilleoir said: "Every plan produced by the Department of the Economy on this issue has been flawed."
Ms Foster and DUP deputy leader Nigel Dodds this afternoon held talks with Deputy First Minister Martin McGuinness and his Sinn Féin colleague Michelle O'Neill.
During the exchanges, Sinn Féin said Mr McGuinness repeated his call for Ms Foster to step aside, without prejudice, pending a preliminary report of an independent investigation.
Ms O'Neill said her party had drafted its own proposed terms of reference for a probe after earlier rejecting proposed terms for the inquiry into the 'cash for ash' controversy.
"These will ensure a robust, time-framed, independent investigation with powers to compel witnesses and subpoena documents," she said.
"This investigation will be led by a judicial figure.
"We have given these terms of reference to the head of the Civil Service and to the DUP."
Ms Foster earlier accused political rivals and social media trolls of misogynistic attacks.
She has been under intense pressure for weeks over her handling of the RHI scandal.
All rival parties at Stormont have demanded she stand aside while her role in the affair is investigated.
Ms Foster oversaw the inception of the RHI scheme during her time as economy minister.
Senior members of Sinn Féin have warned they will exercise their power to collapse the powersharing Executive if Ms Foster does not temporarily stand down to facilitate a probe.
If the republican party follows through with that threat Northern Ireland will be facing a snap Assembly election, less than a year after the last one.
Misogyny claims dismissed as 'nonsense'
Ms O'Neill dismissed as "nonsense" claims from Ms Foster that misogyny is motivating calls for her to stand down.
Ms O'Neill said an assertion by the DUP leader that her gender was fuelling criticism of her role in a botched green energy scheme was a diversionary tactic.
"Arlene Foster is trying to divert attention away from getting to the truth and holding those responsible to account," said Ms O'Neill.
Alliance Party leader Naomi Long also rejected Ms Foster's misogyny claims.
"There is misogyny and sexism in politics, just as there is bullying, but it's a dangerous game to misrepresent being held accountable for your actions as any of those things," she said.
Ms Foster claimed the fact she is the first female to hold the leading position in the Stormont Executive is an issue with many of those demanding she step aside.
"A lot of it is personal, a lot of it sadly is misogynistic as well because I am a female - the first female leader of Northern Ireland - so I firmly believe that is the case as well," she said.
'Burn to earm'
The state-funded RHI was supposed to offer a proportion of the cost businesses had to pay to run eco-friendly boilers, but the subsidy tariffs were set too high, and without a cap, so it ended up paying out significantly more than the price of fuel.
This enabled applicants to "burn to earn" - getting free heat and making a profit as they did it.
Claims of widespread abuse include a farmer allegedly set to pocket around £1 million in the next two decades for heating an empty shed.
Highlighting her first-hand experience of violence during the Troubles, Ms Foster insisted she had been through much worse in her life and made clear she was going nowhere.
"I have come through a lot worse than venomous attacks from my political opponents and I intend to continue to lead," she told Sky News.
"It's no secret that during my childhood the IRA tried to murder my father, it's no secret that in the past the IRA put a bomb on my school bus, so do I really think I am going to step aside at the behest of Sinn Féin? No I am not."
Asked if temporarily leaving her post was preferable to an election, Ms Foster insisted there was no reason to stand down, as she had "done nothing wrong".
"Simply because I am a woman doesn't mean I am going to roll over to Sinn Féin - I am not going to roll over to Sinn Féin, I am not going to roll over to my political opponents," she said
In a further media interview, Ms Foster claimed the party was in "inner turmoil".
"The Deputy First Minister, Martin McGuinness, is not well and there seems to be some jockeying for position internally," she told the Belfast Telegraph.
"They think this is an opportunity to weaken unionism, but, speaking to ordinary unionists across the province, they tell me we are the party that speaks for them."
It was originally envisaged that the Treasury would foot the bill for the RHI, but the costs spiralled well beyond London's financial commitment.
The total RHI spend in Northern Ireland is estimated at £1,150 million over the next 20 years.
The British Treasury is set to cover £660 million of that, with Stormont landed with the remaining £490 million.