It is, to put it mildly, a strange situation. Catherine Martin, deputy leader of the Green Party, is odds-on to take a heavy-hitting cabinet post if a three-party coalition deal can be done with Fine Gael and Fianna Fáil.
But she is against opening those coalition talks right now because she believes Fianna Fáil and Fine Gael needed to deliver "greater clarity" on their intentions.
The Dublin-Rathdown TD had a very tetchy public exchange with Tánaiste and deputy Fine Gael leader Simon Coveney last Friday on the vexed issue of 7pc-per-year carbon emission reductions.
The Fine Gael TD and former agriculture minister had said he could not agree to the 7pc if it had a bad impact on rural Ireland. Ms Martin said those comments were quite disturbing and raised doubts about whether Fine Gael was approaching the issue in good faith.
There was dismay among some in the Fine Gael ranks at Mr Coveney's comments and their timing. Some observers believe it speeded up granting acceptance of 7pc by Fianna Fáil and Fine Gael.
Green Party leader Eamon Ryan is today due to meet his counterparts, Leo Varadkar and Micheál Martin. The talks are beginning on the basis of a two-thirds majority decision by the Greens' 12 TDs on Sunday.
If any coalition deal emerges, and that cannot be taken for granted, it will require the endorsement of two-thirds of the party's members.
Ms Martin has made it clear that she accepts the majority decision of her Dáil colleagues - but she was clearly against these talks in the current circumstances.
The situation is really an example of politics being done in a very tight space. Ms Martin's husband, Francis Noel Duffy, is a Green Party TD for neighbouring Dublin South West. Her brother, Cllr Vincent P Martin, was unlucky not to win a Dáil seat for the party in Kildare North and would be in the running for a Seanad nomination if a coalition deal is ultimately done.
Last time around, in June 2007, the Greens' coalition debate was between the realists and the fundamentalists - with a five-to-one win by realists. This time things are different, with new members who have joined in the years since the party's 2011 electoral meltdown being far more to the left and having little empathy with the big establishment parties.
There is also a certain coterie of people in the party ranks who are personally ambitious and less than happy with Mr Ryan's leadership. According to Article 5.7.4 of the party constitution, there must be a leadership election within six months of the last general election on February 8, fixing a deadline of August 8 next.
Ms Martin is seen by many within the party as loyal to Mr Ryan's leadership - but deeply sceptical about the prospects of getting a durable coalition deal, especially when it comes to climate change. Her next moves will be closely watched and she could be a rallying point for those unhappy with Mr Ryan. On the other hand, if she could be won over to back a coalition deal, she could be a very influential figure in selling it to the party faithful.
But all of this creates further difficulties for both Fianna Fáil and Fine Gael.
Concessions granted to the Green Party could be very hard to sell in their rural heartlands.