A Liberal senator has cast doubt over Sussan Ley's leadership as party figures prepare to finally settle a position on net-zero emissions targets.

After a fortnight of damaging infighting and supercharged leadership speculation, former frontbencher Sarah Henderson said she could not continue to "back things the way they are" ahead of a key partyroom meeting in the coming week.

"I do have to say really honestly, I do think Sussan is losing support," the senator told Sky News on Friday.

"But I do believe in miracles."

Asked whether the party can turn itself around with Ms Ley at the helm, Senator Henderson took a long pause before reiterating she could not support the "way things are".

"I'm not in the business of throwing anyone under the bus, I'm stating the bleeding obvious, we are in

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