DUP leader Arlene Foster has accused Theresa May of engaging in "propaganda" to sell her Brexit deal.
Mrs Foster said she was disappointed that the British Prime Minister had "given up" on getting a better agreement on the UK's exit from the European Union.
Mrs May is visiting Belfast today as part of a series of engagements aimed at selling her draft withdrawal deal to voters.
The prime minister has insisted that the agreement is the best possible option.
However, the DUP has rejected the deal amid claims it threatens the union and will have serious economic consequences for the north.
Read more:Arlene Foster urges British government to stop 'wasting time' and seek a 'better deal' on Brexit
But Mrs May rejected that claim and said that getting a withdrawal deal was about "compromising".
The 27 other EU leaders approved the withdrawal deal at a summit on Sunday.
Mrs Foster said that the prime minister was "wasting time" because the Commons, including her party's 10 MPs, would not back the agreement.
Her party has threatened to review its 'confidence and supply' deal with the minority Tory government if the deal is backed by MPs.
In an interview with the BBC, Mrs Foster said: "The disappointing thing for me is that the prime minister has given up and she is saying this is where we are and we just have to accept it.
"She may have given up on further negotiations and trying to find a better deal but I have not given up.
"I believe in a better way forward and I believe we must find that."
Mrs Foster added that it was "offensive" to suggest that the government could offer a further financial package to get the DUP on board.
Read more:
- DUP Conference - Arlene Foster says sorry for party's role in botched RHI scheme
- Brexit timeline of key events
