Nominations for Northern Ireland’s first and deputy first ministers are expected later after a stalemate over Irish language laws was resolved.
NI Secretary Brandon Lewis said the DUP and Sinn Féin intended to nominate at the “earliest opportunity”.
It comes as the UK government says it will legislate for language protections if the Stormont executive does not.
The legislation was part of the deal that restored power-sharing last January.
Sinn Féin had said it would not support a new Democratic Unionist Party (DUP) first minister unless the UK government passed the legislation.
When Arlene Foster stood down as first minister on Monday, Sinn Féin’s Michelle O’Neill also lost her position as deputy first minister because the roles are a joint office.
The DUP has named Paul Givan as its pick to replace Mrs Foster, while Sinn Féin said Ms O’Neill would resume her post as deputy first minister.
It is understood the Stormont business committee could meet at short notice to try to arrange a special sitting on Thursday to nominate a first and deputy first minister.
On Thursday morning, an assembly spokesperson confirmed that the speaker is engaging with the parties and details of any sitting will be issued later.
DUP leader Edwin Poots confirmed his party will nominate Paul Givan as first minister, after a row over Irish language legislation was resolved.
The DUP left its meeting with the NI secretary without talking to the media.
Mr Poots had previously said he intended to support Irish language legislation but not necessarily before the next assembly election.
In a letter to MPs and MLAs setting out his position on the talks, released on Thursday morning, he said Sinn Féin’s decision to set “ultimatums and deadlines” was unnecessary.
He said the place for all legislation agreed in New Decade New Approach (NDNA) was “through the assembly”.
‘Huge amount of work’
Talks at Stormont continued late into Wednesday night, with Sinn Féin returning just before midnight to resume negotiations with the NI secretary.
What is New Decade, New Approach?
The meetings came amid a stand-off between Sinn Féin and the DUP over the appointment of a first and deputy first minister, and the introduction of Irish language legislation provided for in the New Decade, New Approach deal.
The deal includes an Office of Identity and Cultural Expression, an Irish language commissioner and a commissioner to enhance and develop the language and culture of the Ulster-Scots/Ulster-British tradition.
Mr Lewis said he was “disappointed” the Stormont executive had not brought Irish language legislation forward in the assembly.
“However, following my intensive negotiations with the parties over the last few days, I can confirm that if the executive has not progressed legislation by the end of September, the UK government will take the legislation through Parliament in Westminster,” he said.
“If that becomes necessary, we will introduce legislation in October 2021.”
Speaking on Good Morning Ulster on Thursday morning, Mr Poots said his party had not been “shirking away” from NDNA and said there was “a lot in the cultural package for unionism”.
He said the pandemic was the reason Irish language legislation had not been implemented.
“If anybody thought that it should have been prioritised ahead of that – that would have been very foolish,” he said.
“In terms of actually dealing with all of the issues contained within [New Decade New Approach], quite a number of those have not been implemented as a result of Covid-19.”
Ms McDonald said Irish speakers had been waiting for 15 years for basic rights and recognition.
“This is important for Irish language speakers and for wider society because power-sharing is based on inclusion, respect and equality,” she said.
“On this basis of what has been agreed I am happy to confirm that Sinn Féin will nominate Michelle O’Neill as deputy first minister and will participate fully in the five-party executive.
“We have a huge amount of work ahead of us as we come out of Covid and as we continue to rebuild the economy, get people back to work and tackle hospital waiting lists.”
A stand-off like no other
As a political contest it was over by half time.
No need for extra time or penalties and in the end the referee was able to blow it up early.
Whatever late drama we did get, it was played out behind closed doors.
This was a Stormont stand-off resolution like no other.
So who won and who lost?
Read the full analysis here.
Taoiseach (Irish PM) Micheál Martin warmly welcomed the news.
“I look forward to working closely with the first minister and deputy first minister,” he said.
“We share significant challenges ahead to build economic and societal recovery as we emerge from the Covid-19 pandemic.
“There is much we can do together in terms of practical cooperation for the benefit of people across this island.”
The clock had been ticking with regards to nominating a first and deputy first minister.
Arlene Foster resigned as first minister on Monday, six weeks after she was overthrown as the leader of the DUP in an internal revolt.
That led to a seven-day deadline for the approval of a new first minister and deputy first minister, failing which the devolved executive would have collapsed, prompting fresh elections.