First Minister Mark Drakeford, will today warn the Prime Minister that a no deal Brexit would be "disastrous for Wales".
Mr Drakeford will tell the Prime Minister she has a moral obligation to prevent the UK crashing out of the EU, which he says would have "seismic repercussions for the whole of the Welsh economy and threaten jobs and businesses throughout Wales".
Wales’ new First Minister and new Brexit Minister Jeremy Miles are today attending a meeting of the Joint Ministerial Committee in London, chaired by the Prime Minister.
Theresa May will urge leaders from the devolved administrations to "pull together" to back her Brexit deal at today's meeting.
The Prime Minister is set to call on Scottish First Minister Nicola Sturgeon and Mr Drakeford, as well as representatives of the Northern Ireland Civil Service, to listen to businesses and get behind her Withdrawal Agreement.
Her message to back the deal comes after her Cabinet agreed to ramp up preparations for the UK crashing out of the European Union without an agreement, and Mrs May will also update the leaders on the contingency plans.