More than half a dozen Cabinet ministers are pushing for Parliament to vote on ‘options’ for how to proceed if Theresa May’s deal fails.
Here are some of the possibilities that could be considered:
NORWAY PLUS
MPs from across parties have been mooting the idea of a Norway model.
It would effectively keep the UK in the single market, with a customs bolt-on to avoid a hard Irish border, and backers say it would keep Britain close to the EU while cutting contributions to Brussels.
However, critics say it has the drawbacks of keeping free movement, – and tightly limiting the possibilities for doing trade deals elsewhere.
The EU is also thought to have concerns about a country the UK’s size joining the EEA, while other states in the group might be resistant.
SECOND REFERENDUM
The so-called ‘People’s Vote’ campaign has been pushing hard for another national vote, with cross-party backing.
MPs would almost certainly want to be asked to back the idea in principle.
The Article 50 process would probably need to be extended to facilitate a referendum, but the EU seems open to that possibility.
However, the biggest problem is likely to be that even if the Commons can agree on holding a vote, they will be be completely split over the question.
Some want it to be a rerun of 2016 with Remain v Leave. Others say it should be May’s deal against no deal.
There are also those who support two rounds of voting, or multiple choice.
CANADA PLUS
Brexiteers have been demanding the UK takes a different approach this time, seeking a looser Canada-style arrangement with the EU.
The arrangement they want would be a relatively clean break from the EU, with the ability to strike trade agreements elsewhere.
But it would fall far short of the low-friction access urged by Labour and large numbers of Tories.
MANAGED NO DEAL
Brexiteers have been floating a ‘managed’ no deal which could feature in the votes.
It would involve the UK offering the EU billions of pounds to secure a transition period, even if there is no wider deal.
However, there is little sign that the EU is ready to agree.