The DUP appear to be split on Brexit with Sammy Wilson saying the party continued to lobby against the Northern Ireland protocol, just days after leader Arlene Foster said she would help implement the agreement.
Ministers are planning new legislation, to be presented to parliament, that could override a key part of the EU withdrawal agreement.
The Internal Market Bill will be published tomorrow.
It is expected to contradict the Northern Ireland Protocol, set up to prevent a hard border between Northern Ireland and the Republic.
Speaking last week the First Minister signalled that her party’s fight against the Northern Ireland protocol was now over.
“Boris Johnson is Prime Minister, he took it to the Commons, he gained the support he needed, and therefore it became law", she told Sky News.
“I mean, there are some who would continue to fight against the protocol, I have to recognise that that is the reality now.
“And what I have to do as a leader of unionism in Northern Ireland is to make sure that I mitigate against the damage to the union. And actually, instead of worrying about the damage, actually take steps to actually strengthen the Union.
“So instead of saying, I wish that hadn’t happened – and I do – how to mitigate against that, and also take steps to make sure that we have a shared prosperity in the future for the whole of the UK”, Mrs Foster added.
However, DUP MP Sammy Wilson said far from agreeing to work the arrangements agreed last October, his party continued to lobby for changes to the Withdrawal treaty.
"The government is focussing on some of the concerns which we had raised and we were right to do that and have continued to do that," he said yesterday.
"The protocol is damaging to businesses in Northern Ireland, damaging to consumers in Northern Ireland and would be damaging to our ability to trade with the rest of the United Kingdom.
"All of us have been taking this message to government on a regular basis
"All of that has maybe contributed to the government now realising that the withdrawal agreement was more damaging to the economy of Northern Ireland and to the economy and independence of the United Kingdom as a whole.
"As a party we've never accepted that ... the border between Northern Ireland and the Irish republic can be dealt with.
"This issue of the Irish border was used by people opposed to Brexit to try and keep the United Kingdom within the EU", Mr Wilson said.
"One thing I am glad about though, regardless of the detail of the bill, is that withdrawal agreement and the very damaging Northern Ireland protocol is now back on the agenda", he added.
