Senior cabinet ministers are gearing up for a crunch meeting where they wil attempt to thrash out a shared position on Britain's future relationship with the EU.
With Tory tensions deepening, there are likely to be clashes between pro-EU ministers such as Philip Hammond, Amber Rudd and Greg Clark, who want to maintain close customs ties with the EU, and Brexiters like Boris Johnson, Liam Fox and Michael Gove, who fear that doing so will restrict the UK's ability to make new trade deals.
It comes after a leaked document revealed European leaders could threaten to restrict the UK's access to the single market if it breaches EU rules during the Brexit transition period.
Jeremy Corbyn and Theresa May will also clash at PMQs at midday.