The Brexit Secretary accused the Remoaners of a “foolish mistake” after the trio seized on yesterday’s Brexit chaos over the Irish border in a bid to call for their own special deal in London, Scotland and Wales.
But Mr Davis told the House of Commons the UK would leave the EU as one as he insisted it is “emphatically” not that the case that any part of the Union will remain in the customs union or the single market.
His scathing remarks come after Scottish First Minister Nicola Sturgeon said on Tuesday “this could be the moment for opposition” to a hard Brexit.
On Monday, Ms Sturgeon, London Mayor Mr Khan and the Welsh First Minister called for their own special Brexit deal after it emerged Northern Ireland were getting a special agreement to avoid a hard border.
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But today, Mr Davis told MPs it was “not something the Government was considering” as he said “no UK government let alone a Conservatoive Unionist one” would accept the UK remaining in the customs union after Brexit.
The First Minister seized on suggestions the UK Government was ready to agree a special deal for Northern Ireland saying there is “no good reason” for Scotland to reach a similar arrangement.
Ms Sturgeon also sought to capitalise on wrangles over the Irish border claiming it reinforced the “importance of being independent”.
The Scottish leader has long called for Scotland, which backed staying in the EU by two-thirds, to remain in the single market and customs union when the UK leaves.
But this was rejected by Mrs May’s government, with Scottish secretary David Mundell saying it was unnecessary.
Yesterday, Mrs May seemed on the verge of negotiating a deal which would move Brexit talks forward to trade before the DUP made a furious intervention.
DUP leader Arlene Foster refused to accept any terms which would see Northern Ireland leave the EU on different terms to the rest of the UK after Mrs May proposed aligning the state with the Republic.
Meanwhile, London Mayor Sadiq Khan tweeted: “Huge ramifications for London if Theresa May has conceded that it’s possible for part of the UK to remain within the single market & customs union after Brexit.
“Londoners overwhelmingly voted to remain in the EU and a similar deal here could protect tens of thousands of jobs.”