Stormont parties have been urged to work together to pass the necessary regulations in order for a stalled organ donation law to be implemented in Northern Ireland.
However, the DUP has made clear it will not be dropping its block on the Stormont Assembly sitting.
MLAs have been recalled to Stormont on Tuesday in an attempt to elect a Speaker and hold a debate on the implementation of the legislation.
The planned law, named after six-year-old Belfast boy Daithi MacGabhann, who is waiting a heart transplant, has become a touchstone issue in the political debate around the powersharing impasse at Stormont.
Sinn Féin MLA Pat Sheehan said his party will be in the Assembly chamber in an effort to elect a Speaker and pass the necessary regulations.
He urged “no more delay in getting this legislation into law”.
Mr Sheehan added: “We owe it to little Daithi and all those people desperately waiting on an organ transplant.
“I would urge all parties to work together in the Assembly on Tuesday and let’s get this done.”
Alliance MLA Paula Bradshaw said the DUP’s refusal to enable the Assembly to sit is “unedifying and serves no purpose”.
She said: “Alliance will use every avenue open to us to get the relevant regulations approved so the new law comes into operation. However, the fact is, the quickest and surest way of achieving this would be via the election of a Speaker and the sitting of the Assembly at Stormont tomorrow. No other route carries any guarantee.
“The regulations are already drafted and ready to go. There is neither excuse nor reason for further delay. The DUP needs to stop playing games with people’s lives and get on with the job its MLAs were elected to do.”
In a weekend message to party members, seen by the PA news agency, DUP leader Sir Jeffrey Donaldson reiterated that his party would not return to devolved institutions unless issues of concern around the Northern Ireland Protocol are resolved.
He again accused the UK government of using the issue as “blackmail” and also claimed Sinn Féin was trying to exploit the matter for political gain.
Mr Donaldson said that the issue could be dealt with at Westminster with an amendment he will introduce to the planned Executive Formation Bill.
Britain's Northern Ireland secretary Chris Heaton-Harris has raised concerns that this route would take longer and might prove difficult. It is unclear whether the scope of the Executive Formation Bill would be wide enough to permit the addition of such an amendment.
The opt-out donation system was passed by MLAs last year, but the secondary legislation required to implement it cannot be approved in the Assembly due to the current political stalemate.
The DUP is preventing the functioning of both the Assembly and the ministerial executive in protest at the protocol.
Only the Assembly would need to be up and running to pass the regulations required to implement the opt-out organ donation system.
Daithi underwent another heart procedure in England last week.
On Friday, his father, Mairtin MacGabhann, implored the North's politicians to do all they could to get the law implemented.
The opt-out system would mean people in Northern Ireland would be presumed to be donors, unless they take a decision to opt out. It is being implemented to increase donation rates in the region.
In the message to party colleagues, Mr Donaldson wrote: “It is disgraceful that the issue of organ donation is being used as blackmail for the return of devolution.
“We will not be nominating a Speaker on Tuesday.
“Westminster is sovereign and can resolve the issue quickly.”
He added: “I will be tabling an amendment to the Executive Formation Bill that will empower the Secretary of State to lay the necessary legislation and see this law in place.
“Given Sinn Féin’s politicking on the matter, let’s see if they take their seats in Westminster to help pass this law in the House of Commons. We won’t hold our breath. Utterly false outrage from Sinn Féin as usual.
“We have a mandate for the action we are taking. The DUP is representing its electorate and there will be no return to a fully functioning Stormont without unionists.”
Several previous recalls of the Assembly have all ended in failure due to the DUP’s stance on preventing the election of a Speaker.
