DUP leader Arlene Foster has repeated her insistence that there should be no customs or regulatory barriers between Great Britain and Northern Ireland, and said she had made this clear to the British Prime Minister Theresa May.
At his latest appearance in parliament, where divisions over how to leave the European Union were on display, Raab moved to downplay one of the thorniest parts of the talks - a so-called backstop arrangement to prevent the return of a hard border between the British province of Northern Ireland and European Union member Ireland.
The party's 10 MPs have propped up the Tory government since May lost her Commons majority in the snap general election previous year.
"The whole point about checks is that there is a difference" she said.
The issue of how to preserve an open border between European Union state Ireland and the British province of Northern Ireland - Britain's only land frontier - after Brexit is the last remaining hurdle, with almost everything else in the withdrawal agreement agreed before Britain leaves next March.
Boris Johnson has accused Theresa May of negotiating a "backstop" solution for Northern Ireland that will turn Britain into a "permanent EU colony" after Michel Barnier insisted the United Kingdom will have to stay in the customs union. They know where we stand.
In order to make progress on the UK's withdrawal agreement at a European Council summit next week, Brussels and London must agree plans for a "backstop" to maintain the status quo along the Irish land border, with trade flowing freely between the Republic of Ireland and the north.
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It was great to see so numerous profession in attendance with enthusiasm to change the status quo. The Lancet commission commission recommends an increase of investment in mental health globally.
"That's why the backstop proposed by Barnier is unacceptable to us".
Speaking alongside DUP MEP Diane Dodds, Mrs Foster said she had not yet seen a fresh text on the Irish backstop, a guarantee of no hard border on the island of Ireland, from the British government. Asked whether that implied her supporters are ready to "fight and die" for them, she replied: "What I meant by that is that they are deep red - they're not pink".
If 40 of her lawmakers voted against a possible deal, the fate of the government and exit process would depend on the opposition Labour Party, which has indicated it will vote against nearly any deal May might secure.
"My estimate is that there are at least 40 colleagues who are not going to accept a "half in, half out" Chequers deal or indeed a backstop that leaves us in the internal market and the customs union".
Following the College of Commissioners meeting, two commissioners stressed the importance of continued UK/EU co-operation on security after Brexit.
Barnier said he realised such checks were politically hard but this was the outcome of Britons voting to leave the EU.