Shadow Cabinet this morning met and backed the package on offer from the Government in bid to garner bipartisan support for its ETS and have the legislation pass the Senate this week.

Opposition Leader Malcolm Turnbull and his climate change negotiator Ian Macfarlane then presented the deal to the Coalition partyroom, where consensus was unable to be reached on whether or not to vote in favour of the legislation.

While some Coalition sources claim that two-thirds of members were in favour of the deal, others insist it is a 50:50 split.

Notably speaking against the package was Andrew Robb, who is currently on sick leave but was previously the Opposition's climate change spokesman.

Sources say Mr Robb spoke passionately for 10 minutes arguing the package was "not good enough" and should be rejected.

The extraordinary partyroom meeting has reconvened after breaking for Parliamentary Question Time in a bid to nut out once and for all where the Coalition stands on the issue.

This morning Mr Turnbull said about 75pc of the Coalition's demands to amend the Government's carbon pollution reduction scheme had been met during the negotiations with Climate Change Minister Penny Wong.

Mr Macfarlane told reporters in Canberra this morning that he was very pleased with deal and described the negotiated package as "exceptional".

It's the biggest test of leadership faced by Mr Turnbull. It had been rumoured that a leadership spill could also take place inside today's joint party meeting because there were still many in the Liberal and National parties who either don't believe with the position to negotiate with the Government, or don't want to vote on a deal before the climate negotiations in Copenhagen, or don't want an emissions trading bill in any form.

Sources said Mr Turnbull needed up to 70pc of the joint party support vote on the deal for his position to be tenable, and it’s believed that despite the Liberal turmoil he still has that level of support.

Regular updates on the situation in Canberra will be posted on FarmOnline sites throughout the day.