More than 3 million people have signed a petition to revoke article 50 - the highest sign-up rate on record.
Data from the petitions website shows support for it in Wales is concentrated mainly in Cardiff - with nearly 12,000 signatures across all four Cardiff constituencies at the time of writing.
Meanwhile support from Ceredigion, Monmouth, the Vale of Glamorgan, Arfon, Swansea West, and Gower make up the top half of constituencies supporting the petition.
All voted to remain in the European Referendum.
This is the list of constituencies in order of most signatures to the least:
- Cardiff West
- Cardiff Central
- Cardiff South and Penarth
- Cardiff North
- Vale of Glamorgan
- Swansea West
- Newport West
- Brecon and Radnorshire
- Alyn and Deeside
- Preseli Pembrokeshire
- Carmarthen East and Dinefwr
- Carmarthen West and South Pembrokeshire
- Clwyd West
- Ynys Môn
- Dwyfor Meirionnydd
- Newport East
- Clwyd South
- Vale of Clwyd
- Swansea East
- Cynon Valley
- Merthyr Tydfil and Rhymney
- Blaenau Gwent
Despite soaring support for the petition across the UK, Theresa May ruled out cancelling the Brexit countdown. She said she did not believe in halting the deadline after the EU offered a delay plan and said the result was 'clear'.
What is article 50?
Article 50 forms part of the Lisbon Treaty which was signed by all members of the European Union in December 2007, and it sets out the rules for the process of a member state leaving the EU.
It started a two-year period for Britain to negotiate terms of its withdrawal from and future relationship with the union.
What happens now?
On Thursday, EU leaders said Brexit could be delayed from March 29 to May 22 – but only on the condition that MPs vote for Mrs May’s deal next week.
If it is rejected in the third “meaningful vote” then the UK would have until April 12 to tell the European Council a way forward.
Read more: EU leaders offer UK Brexit delay to May 22