Mr Chapman cannot know what the proposals are unless he has been told by the negotiators, and without being unkind to him, I doubt that that is the case, to be honest.
I say to him that I want the best possible deal for everyone who is involved so that we get the best deal for Scotland. Therefore, I will join him if, at any stage, he argues that what we want is a deal that is fair to the people of Scotland, that produces long-term results and that does not create an enormous amount of bad feeling.
However, if he is trying to say that it is all the fault of somebody else and not the fault of the party of which he is a representative, he is utterly wrong. Brexit is a disaster that is owned by the Conservatives—I am glad to see him nodding—and they must take responsibility for it, including the member.