Coalition backbenchers are preparing for a showdown on net zero as pressure mounts on Sussan Ley’s opposition to resolve its position, with speculation more MPs could join Barnaby Joyce in quitting if the policy isn’t dumped.

Liberal and Nationals MPs have been invited to remain in Canberra after the upcoming sitting week for a three-hour, closed-door debate on energy policy, including net zero by 2050.

Guardian Australia understands most Nationals MPs won’t be able to attend next Friday’s meeting due to a diary clash.

The meeting is not designed to settle a final position but rather give backbench MPs an opportunity to argue their case for or against retaining a target that was originally agreed under Joyce and Scott Morrison’s leadership in 2021.

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