My view is that they won't vote for a sea border, which is why I disagree with you.
The discussion has been whether they would support May's plan, and potentially a referendum with it as an option on the ballot. Foster called the leaked details of the negotiations a "total betrayal" and the possibility of it a "blood red line." They will not vote for May's plan if it's part of it, and they will not vote for a referendum if it's on the ballot. They will not support it, nor will they be accountable in it coming about by making it possible with their votes.
The discussion has been whether they would support May's plan, and potentially a referendum with it as an option on the ballot. Foster called the leaked details of the negotiations a "total betrayal" and the possibility of it a "blood red line." They will not vote for May's plan if it's part of it, and they will not vote for a referendum if it's on the ballot. They will not support it, nor will they be accountable in it coming about by making it possible with their votes.