The Scottish Greens will next week back a motion of no confidence in Humza Yousaf.
It is understood all the party's MSPs will vote for the motion which has been lodged today by the Conservatives.
The vote in Holyrood is expected to take place next week.
Speaking this afternoon, Mr Harvie rejected a suggestion that the move was revenge on the part of the Greens, saying that would be an "unworthy" thought, but it was clear the situation has stung the party.
Asked how the Greens might work with Humza Yousaf in the future, having voted against him, Mr Harvie said: "We spent the last two-and-a-half years, nearly three years now, working constructively between two political parties.
READ MORE: Harvie adds to speculation over Yousaf's leadership as pact ends
READ MORE: SNP look to Humza Yousaf succession after worst week
"I think politics is at its best when political parties do seek the common ground and work hard to try and make cooperation possible.
"It is Humza Yousaf who has decided to tear up the basis on which that cooperation is taking place in the future."
Ms Slater added: "How can he work with us, having treated us this way?"
The move to back the motion of no confidence in the First Minister was unanimous from the Greens parliamentary group.
The Scottish Greens are the latest party which has signalled its support for the bid to oust the First Minister following the ending of the Bute House Agreement later today.
Labour, the Lib Dems have all said they will be supporting it.
READ MORE: Yousaf facing no confidence vote after deal with Greens ends
READ MORE: Analysis: Humza Yousaf's grip on power heads to endgame
Should all MSPs in those parties back the motion it will mean that the motion gets the support of 63 MSPs.
And if all SNP MSPs vote against, it would mean 62 MSPs opposing it.
Ash Regan, the Alba MSP, has set out a list of demands in return for her voting with the SNP.
That would mean a tied vote of 63 each way.
In that scenario, it is parliamentary custom for the Presiding Officer would vote to maintain the status quo, meaning she would support the SNP side.
Earlier Patrick Harvie raised questions over whether Mr Yousaf's government would survive into next year.'
Asked at a hastily arranged press conference whether his party would back Mr Yousaf's next budget, Mr Harvie replied: "Do you think the current government will be in place by the time of the next Budget?"
Why are you making commenting on The Herald only available to subscribers?
It should have been a safe space for informed debate, somewhere for readers to discuss issues around the biggest stories of the day, but all too often the below the line comments on most websites have become bogged down by off-topic discussions and abuse.
heraldscotland.com is tackling this problem by allowing only subscribers to comment.
We are doing this to improve the experience for our loyal readers and we believe it will reduce the ability of trolls and troublemakers, who occasionally find their way onto our site, to abuse our journalists and readers. We also hope it will help the comments section fulfil its promise as a part of Scotland's conversation with itself.
We are lucky at The Herald. We are read by an informed, educated readership who can add their knowledge and insights to our stories.
That is invaluable.
We are making the subscriber-only change to support our valued readers, who tell us they don't want the site cluttered up with irrelevant comments, untruths and abuse.
In the past, the journalist’s job was to collect and distribute information to the audience. Technology means that readers can shape a discussion. We look forward to hearing from you on heraldscotland.com
Comments & Moderation
Readers’ comments: You are personally liable for the content of any comments you upload to this website, so please act responsibly. We do not pre-moderate or monitor readers’ comments appearing on our websites, but we do post-moderate in response to complaints we receive or otherwise when a potential problem comes to our attention. You can make a complaint by using the ‘report this post’ link . We may then apply our discretion under the user terms to amend or delete comments.
Post moderation is undertaken full-time 9am-6pm on weekdays, and on a part-time basis outwith those hours.
Read the rules hereLast Updated:
Report this comment Cancel