Sky News have seen a letter from Boris Johnson to the Prime Minister, in which he says "it is wrong to see the task as maintaining 'no border'" on the island of Ireland after Brexit.
Commenting, Ian Murray MP, leading supporter of the Open Britain campaign, said:
"Boris Johnson promised ahead of the referendum that there would be no change to the invisible border in Ireland. Yet this leaked memo suggests he would rather undermine the Good Friday Agreement and the peace process than take the only path towards fulfilling his promise: keeping the whole of the UK in the Single Market and Customs Union.
"It can be little wonder that negotiations over Ireland are now severely strained: because Theresa May and her ministers have consistently failed to be honest about the implications of the hard Brexit they seek.
"As the threat to the integrity of the peace process from Brexit becomes clear, we all have the right to keep an open mind as to whether that it is too high a price to pay."
Notes to editors
In the lead-up to the referendum campaign, Boris Johnson said the situation on the island of Ireland would be unaffected:
"I think the situation would be absolutely unchanged."
Boris Johnson, BBC News, 29 February 2016
The Sky News story is online here: https://news.sky.com/story/boris-johnson-tells-pm-wrong-to-see-govt-task-as-no-irish-border-after-brexit-11270041