Scottish and Welsh politicians are joining forces to urge the prime minister to change her position on Brexit.
The Scottish Parliament and the Welsh Assembly will vote on the same motion at 18:00 calling for the planned exit date of March 29 to be put off.
MSPs and AMs will also reiterate their opposition to the UK government’s plans and to leaving the EU without a deal.
The UK government said its deal is a good one for Scotland and Wales.
It said the focus should be on gaining further assurances from the EU to allow the prime minister’s deal to go forward.