Plaid Cymru has ended its co-operation deal with Labour in Wales immediately, piling more pressure on First Minister Vaughan Gething.
Plaid leader Rhun ap Iorwerth said he was proud of what the agreement had achieved, but had "deep concern" about matters, including the circumstances surrounding the first minister's £200,000 leadership campaign donation.
It will make life more difficult more difficult for Mr Gething, as Labour will have to rely on other parties in the Senedd to push through legislation.
It comes after a turbulent week in the Senedd when Mr Gething sacked one of his ministers, and he said he was was “disappointed Plaid Cymru has decided to walk away from their opportunity to deliver for the people of Wales”.
What is the co-operation agreement?
Labour Members of the Senedd (MSs) will meet at 17:00 BST to discuss Plaid pulling out of the deal.
The three-year deal between the two parties was agreed in December 2021 under Mr Gething's predecessor Mark Drakeford, after the Senedd election where Labour secured 30 seats - one short of an outright majority.
Labour minister Jeremy Miles said at the time the result allowed the Welsh government to work with parties on a "case-by-case basis", and Mr Drakeford said Labour had governed successfully on 30 seats before.
But with the Welsh Labour government requiring votes from opposition parties before it could pass any laws or get spending plans through the Senedd, it later entered the agreement with Plaid.
It was not a formal coalition, but meant Labour and Plaid worked together on 46 policy areas.
Mr Gething has come under scrutiny since his election as first minister following criticism of a £200,000 donation he received for his leadership campaign from a company owned by a man previously convicted of environmental offences.
On Thursday, he sacked his minister for social partnership, Hannah Blythyn, alleging that she leaked text messages to the media.
It followed a story, originally published by Nation.Cymru, which revealed Mr Gething told ministers he was deleting messages from a pandemic-era group chat.
