LONDON (AP) — Scotland's leader is facing a fight for his political survival after he ended a three-year power-sharing agreement with the Scottish Green Party following a clash over climate change policies.

Thursday's decision by First Minister Humza Yousaf of the Scottish National Party to tear up the deal with the much smaller Greens with immediate effect has triggered a series of events that could see him lose the top job next week and even lead to an early election.

The termination of 2021’s Bute House Agreement between two parties that back Scotland's independence from the U.K. prompted the main opposition party in the Edinburgh-based parliament, the Scottish Conservatives, to say they will put forward a vote of no confidence in the first minister next week.

If all opposition legislators, which now include the Greens, vote against him, Yousaf would lose and he would come under huge pressure to resign, which could set a path towards an early election — the next Scottish parliamentary election isn't due until 2026.

Of Parliament’s 129 seats, the SNP holds 63, two short of a majority.

The Greens confirmed late Thursday that they would be voting against Yousaf, along with the other main opposition parties, including the Conservatives and Labour.

“We no longer have confidence in a progressive government in Scotland doing the right thing for climate and nature,” co-leader Lorna Slater said.

Yousaf, who replaced long-time leader Nicola Sturgeon, may need the vote of a former SNP lawmaker, Ash Regan, to survive. She has indicated that she would seek to extract a price from Yousaf in order to back him in the no-confidence vote.

The announcement by the Greens capped a dramatic day in Scottish politics.

Relations between the SNP and the Greens, which both back Scotland’s independence from the U.K., soured recently, particularly in the last week after Yousaf abandoned a key climate change target, specifically the goal of reducing emissions by 75% by 2030, arguing that it was “beyond what we are able to achieve.”

Many members of the Greens were furious at the decision, and a vote was planned on whether it would continue to participate in the government. Yousaf denied he was ending the agreement to preempt a vote to end the coalition.

“It is no longer guaranteeing a stable arrangement in Parliament — the events of recent days have made that clear, and therefore, after careful consideration, I believe that going forward it is in the best interest of the people of Scotland to pursue a different arrangement,” he said at a news conference.

It was a risky decision as the SNP doesn't have a majority and, if it survives as an administration, will have to rely on votes from other parties to get legislation and the budget through Parliament.

Yousaf said that the SNP has often governed as a minority administration since it first came to power in 2007.

The decision to end the agreement also came as the SNP has been rocked by the news earlier this month that Sturgeon's husband, Peter Murrell, has been charged with embezzlement in an investigation into the party's finances.

Opinion polls are showing that the SNP, which has dominated politics in Scotland since 2007, is facing stiff opposition from the Labour Party as the U.K. general election draws nearer. The vote will take place sometime in the coming months. If Labour can grab a sizeable chunk of seats in Scotland, it could well be on course to win a majority, even a big one.