In April 2024, Humza Yousaf, first minister of Scotland and leader of the Scottish National Party (SNP), faced a confidence challenge following his termination of the Bute House Agreement between the SNP and the Scottish Greens, which meant that Patrick Harvie and Lorna Slater, co-leaders of the Greens and their only government ministers, were removed from government.

[2] This was following changes to landmark climate policy by Cabinet Secretary for Wellbeing Economy, Net Zero and Energy Màiri McAllan,[3] after which a planned Greens vote on the continuation of the agreement was announced.

[10] Some policies were changed to gain the Greens' support,[11] such as their proposal to stop North Sea oil drilling,[12] which some SNP figures, such as Kate Forbes, criticised, alongside their plans to phase out the natural gas industry.

[18] The Green MSP Ross Greer spoke of the deal's policy achievements, including "record funding for wildlife and nature", "free bus travel for under-22s", and "the most progressive tax system in the UK".

[20][21] On 18 April 2024, Cabinet Secretary for Wellbeing Economy, Net Zero and Energy Màiri McAllan scrapped climate change targets,[3] causing the Greens to call a vote on whether to continue the power-sharing deal.

[24] Alex Salmond, former SNP First Minister and now leader of Alba, called Regan the "most powerful MSP in the Scottish Parliament".

[37] Late on 28 April, it was speculated that Yousaf planned to step down the next day, fearing that he could not survive the no confidence vote against him: he did, announcing that he would resign as both leader of the SNP and first minister of Scotland once his successor has been chosen.