But UK comments on overriding parts of the Brexit deal to assuage unionists provokes EU anger.
The DUP has refused to say if it will support the election of a new Speaker when the Northern Ireland Assembly meets on Friday.
It is due to be the first order of business after the assembly election, which saw Sinn Féin win the most seats for the first time.
The assembly cannot function if a speaker is not elected.
Sinn Féin’s Michelle O’Neill accused DUP leader Sir Jeffrey Donaldson of holding society to ransom.
The DUP has said it will not nominate ministers to form a new executive until its concerns about the Northern Ireland Protocol – the post Brexit trading arrangements for Northern Ireland – are resolved.
On Wednesday, Prime Minister Boris Johnson said the protocol was “not working for the balance of the Good Friday Agreement”.
The protocol, part of the government’s Brexit deal with the European Union, was designed to ensure free trade could continue across the Irish land border by keeping Northern Ireland aligned with the bloc’s single market for goods.
However, it has faced criticism from some unionists who argue it has undermined Northern Ireland’s position in the UK by placing additional checks on some goods crossing the Irish Sea.
Sir Jeffrey told BBC News NI his party’s assembly members (MLAs) would attend Stormont on Friday to sign the membership roll, but that a decision still had to be made about the election of a Speaker.
The prime minister told BBC News that the protocol’s rejection by much of the unionist community means “we have to fix it”.
“I don’t think it needs to be a big drama,” he added.
Earlier, Irish Foreign Affairs Minister Simon Coveney said comments by the UK government about taking unilateral action on the Northern Ireland Protocol had gone down “really badly” across the EU.
Mr Coveney said he believed there was a “landing zone” for progress, but that this should come through partnership “as opposed to grandstanding, threats and unilateral action which doesn’t help anybody”.
The election of a new Speaker needs cross-community support from both unionist and nationalist members.
A new Speaker would mean assembly business could take place for up to six months, even in the absence of a functioning executive.
The latest impasse comes after the 5 May election cemented a majority for assembly members who accept the Northern Ireland Protocol, including the new largest party, republicans Sinn Féin.
Blocking election of Speaker means no assembly scrutiny
If the DUP is in the mood now to try and ramp up pressure and to try, I suppose, to strengthen the hand of the UK in Brussels negotiations in terms of the stalemate at Stormont, then blocking that process on Friday would certainly do that.
Because that then would block the shadow assembly, would block MLAs, if nothing else, creating the image of government not working here in Northern Ireland.
And while caretaker ministers will remain in place even without an assembly, there will be no opportunity to scrutinise ministers in the chamber or on committees.
If that process is blocked, then you’re going to see things moved to a whole new level.
Because if the Stormont safety net all of a sudden isn’t there to protect Stormont, then what else is?
Sir Jeffrey said he believed the pressure his party was bringing to bear on the issue of the protocol was beginning to have an impact.
“It’s action I want to see and until I see that action and I’m satisfied that it deals with the issues that need to be dealt with in relation to the removal of that internal border within the United Kingdom, I can’t make a decision [on returning to government] until I see what is going to happen here,” he said.
“The government has to act.”
Speaking after meeting Mr Coveney, Ms O’Neill said Sir Jeffrey’s comments were “not good enough” and accused the DUP of holding society to ransom.
“I’ll make this call to him again today, join the rest of the parties who will be there on Friday, who will be there to elect a speaker, who will be there to nominate ministers for positions, who will be there to get down to business,” she said.
Ms O’Neill added that the protocol was here to stay and accused the British government of “pandering to the DUP”.
Naomi Long, leader of the Alliance Party, said any unilateral action by the British government would be “utterly reckless”.
“We are very clear on what they [the government] should be doing – they should be engaging very intensively with the European Union and any change they make to the protocol needs to be mutually agreed by the UK and EU,” Mrs Long said.
Before his meeting with Mr Coveney, Doug Beattie, leader of the Ulster Unionist Party (UUP), said the Irish foreign minister knew there was a “landing zone” for sorting out unionist concerns with the protocol.
“That landing site is no checks on goods from Great Britain to Northern Ireland,” he said.
Mr Beattie said that despite these issues, it didn’t give the DUP “the excuse to stay out of government”.
Colin McGrath, who was elected for the Social Democratic and Labour Party (SDLP) in South Down, said the election of a Speaker was necessary to ensure ministers could be held to account.
If the move is blocked, he told BBC News NI’s Talkback programme: “The DUP need to go off and consider can they legitimately use the word democratic at the start of their name.”
‘Worsen current arrangements’
On Tuesday, the UK rejected EU plans aimed at reducing the impact of the post-Brexit treaty for Northern Ireland, saying they would make things worse.
The EU claimed the proposals would reduce paperwork and checks on goods entering NI from Great Britain.
But the government said they would “worsen the current trading arrangements”.
The UK verdict was part of an escalating dispute which could soon see the government scrapping parts of the deal.