Four ministers have resigned from the Welsh government, saying First Minister Vaughan Gething must leave office.
Mick Antoniw, Julie James, Lesley Griffiths and Jeremy Miles have all quit their government positions, citing a lack of confidence in their leader.
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It comes a month after Mr Gething lost a vote of no confidence - but dismissed the motion as a "gimmick" and vowed to carry on.
In his resignation letter, counsel general Mr Antoniw said he believed the first minister's position was untenable as he urged him to "put the country first".
He said the Senedd was "rudderless" without a new leader.
"Wales needs confident and stable government. I do not believe you are capable of delivering that," he wrote.
"You have lost a vote of confidence in the Senedd. That is something I regard as being of major constitutional importance.
"It is clear that you no longer command a majority, that you will be unable to enter into the agreements necessary to pass a budget, and for all intents and purposes the Senedd is rudderless."
He added: "We are all here to do the best for our country. I believe it is now necessary for you to choose to put the country first and resign as First Minister to allow an election for a new First Minister and leader of Welsh Labour."
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