I am grateful to my right hon. Friend for his question. I have never underestimated the challenge that I face today or the one that the Government face. As I shall come on to say in due course, I have reflected deeply, as he knows, upon the question of the backstop. I have reached the conclusion that it is a risk that it is acceptable to take, even having regard to the perils that it involves if it were to become permanent and the questions that it unquestionably raises in connection with the Union with Northern Ireland.