THE Stormont assembly is scheduled to sit next week after the SDLP secured the necessary number of MLAs' signatures to force a recall.
The party reached the 30-signature threshold yesterday with support from both Sinn Féin and Alliance .
Details of Tuesday's sitting were confirmed by outgoing assembly speaker Alex Maskey.
The SDLP tabled its recall petition on Wednesday, with leader Colum Eastwood claiming it would "test the DUP's commitment to the devolved institutions".
But DUP leader Sir Jeffrey Donaldson last night signalled that the election of speaker was highly unlikely, while chief whip Joanne Bunting described the recall as a "stunt".
The DUP has refused to support the restoration of the institutions in the wake of May's assembly election, in which it was superseded as Stormont's largest party by Sinn Féin.
Tuesday will be the third time the assembly has sat since the election, and its second recall.
The DUP is expected to attend next week as the votes of the party's MLAs are necessary to block the election of a speaker.
The SDLP said it was recalling the assembly from its summer recess to hear a motion on the cost of living crisis.
It challenged the DUP to agree to elect a speaker after the Northern Ireland Protocol Bill completed its third reading in the House of Commons.
Sir Jeffrey has previously said that his party's response to the legislation's progress at Westminster would be "graduated and cautious".
SDLP MLA Matthew O’Toole said his party was challenging Sir Jeffrey's "integrity as a political leader" as well as the DUP's commitment to "respecting the result of May’s election".
“The protocol bill has, unfortunately, passed its Commons stages and it is time for Jeffrey Donaldson to make his mind up," the South Belfast representative said.
"He cannot keep speaking out of both sides of his mouth when it comes to the restoration of the assembly and the executive."
The motion submitted by the SDLP for debate on Tuesday highlights the "immense hardship facing people and families" across the north.
Mr O'Toole said at a time when working households were "facing a real emergency", there was no justification for the DUP's ongoing boycott and "cheap political games".
But Sir Jeffrey said that despite the progress of the legislation, his party was still not prepared to reengage with the Stormont institutions.
"We are clear that we need to see further progress made," he told the BBC.
"It is good that the legislation, the Northern Ireland Protocol Bill, has now completed all stages in the House of Commons but, of course, we want to know if a new prime minister remains committed to taking this legislation forward and we will be engaging with both the leadership contenders and their teams over the next few weeks."
He said his party had yet to secure its desired solution to the issues around the protocol.
"We've got a pathway now that can take us to that solution," he said.
