Neither can Labour, who want to stay in the EU and leave the EU simultaneously.
Their current 6 test will never be met, so they vote against. That leaves the Euroskeptics in the Tories with the casting vote, and since there are quite a few of them, that means a clean rather than a messy brexit.
Even the idea for a vote on the deal won’t be won.
How do you think asking the UK voters to pay 100 bn to the EU and sack nurses because the EU choose the socialist pension route and spent all the contributions [instead of investing them which is capitalist? That’s with Junker signing off the pensions regulations every month. He can’t claim ignorance