it's hard to chose a "best bit" of such a withering and comprehensive destruction of the PM's case, but I liked this bit:

"....he claimed on Wednesday it was necessary to Protect the good Friday agreement.
I have to say I would rather trust the authors of the good Friday agreement than a Prime Minister who has prominent members of the government who opposed the agreement.
This is what John Major and Tony Blair wrote “[the bill] puts the good Friday agreement at risk because it negates the predictability, the political stability, and legal clarity that are integral to the delicate balance between the north and south of Ireland that is at the core of the peace process”.

He may not want to believe them but maybe he will believe himself.
Because this is what he said about the NI Protocol: “there are particular circumstances in Northern Ireland at the border that deserve particular respect and sensitivity, and that is what they have received in the deal.
This is… a great deal for Northern Ireland”.

This is not just legislative hooliganism, it is hooliganism on the most sensitive of issues".