Because I'm confused!
I thought that TM originally proposed a backstop of NI remaining in CU/SM, the the DUP immediately vetoed that so we reverted to saying the whole of the UK would remain aligned with SM /CU wrt issues affecting the border.
Barnier said in his speech they never wanted to create a border in the North Sea either.
So WTF is TM on about now saying the EU need to 'evolve' on the backstop?
This has been agreed already.
What am I missing here?