The Scottish Green Party will join with rival MSPs to back a no confidence motion in the country's first minister next week, after the SNP kicked its coalition partners out of government.
Humza Yousaf announced his plan to cut ties with the Greens earlier on Thursday, following a bitter row over the SNP's climbdown on climate targets.
And soon after, the Scottish Conservatives announced it would lodge a vote of no confidence in him, claiming Mr Yousaf had "failed" in his role as first minister and had "focused on the wrong priorities for Scotland".
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Both Labour and the Liberal Democrats agreed to back the motion, with its success hanging on whether Green Party MSPs join the attack and give the SNP critics a majority in Holyrood.
But its co-leader, Patrick Harvie, is expected to make an announcement at 5.30pm that they will join forces to condemn Mr Yousaf's leadership, with Green sources telling Sky News there was serious anger among the ousted party.
If the vote passes, it will still be up to Mr Yousaf to decide on how to respond. However, its puts increasing pressure on his position if he fails to hold the confidence of the majority of the parliament.
However, if a no confidence vote was passed on the government, the SNP would have to appoint a new first minister within 28 days or call an election.
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