Tensions between the two parties rose after the Scottish Government scrapped plans to cut Scotland's carbon emissions by 75 per cent by 2030 compared to 1990 levels.
Yousaf – who has been under pressure from some in his own party to find time for a deal amid a series of other political disputes – held an emergency cabinet meeting on Thursday morning to address growing differences between the two parties.
Members of the Scottish Green Party were due to vote on whether to abandon the deal, with Harvie saying he could not remain in the leadership if members approved a withdrawal.
The SNP has 63 of the 129 seats in Holyrood and is expected to continue as a minority administration until the next Scottish Parliament election in 2026.
This development story will be updated.