The DUP has called on Prime Minister Theresa May to start making decisions in the absence of devolved government in Northern Ireland.
Party leader Arlene Foster and deputy leader Nigel Dodds met the PM on Monday.
Speaking afterwards, they said they told her Northern Ireland is crying out for decisions to be made on a whole range of issues.
The DUP has a supply and demand deal with the Conservatives.
On Brexit, when asked if Theresa May could count on their support, they said they told her “we don’t give blank cheques to anyone”.
Mr Dodds MP said: “We want to see a proper Brexit which fulfils the referendum result.
“We have been very clear that has to be on the basis that the whole of the UK leaving the EU as one. I'm confident the PM will deliver on that."
Mr Dodds told reporters he and Ms Foster had spent almost 90 minutes in talks with the Prime Minister at 10 Downing Street.
He said a new customs plan to solve the Irish border issue was discussed but the PM "didn't go into any details".
He said Ms May told them the UK will not remain in the customs union or the single market after Brexit.
Mr Dodds also accused Taoiseach Leo Varadkar and other European leaders of attempting to "bully and intimidate" the UK into agreeing a deal of their liking.