The Democratic Unionist Party (DUP) has "yet to come to terms with the significance" of the vote in support of the new Brexit deal, Northern Ireland Secretary Chris Heaton-Harris has said.
His comment comes a day after MPs voted by 515 to 29 to support the Windsor Framework deal agreed by Rishi Sunak.
The DUP voted against it, saying the UK government had to make changes to it.
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Sinn Féin vice-president Michelle O'Neill said the DUP had to "stop their boycott" of Stormont so that executive ministers could take control of the budget.
Ministers had to be in post to make the case to the Treasury for extra funding for Northern Ireland, Ms O'Neill added.
"This budget is about to cause catastrophic damage to public services," she said.
"So the DUP need to get around the table with the rest of us, make politics work."
Alliance Party MP Stephen Farry said Northern Ireland was "bleeding at present", with problems piling up and public services in real crisis.