Former prime minister John Howard is urging the Liberal Party to "get behind" Sussan Ley as political infighting threatens to end her leadership of the coalition.

The opposition leader on Friday was again forced to bat away questions surrounding her job, declaring she was not "commenting on commentary" after Liberal senator Sarah Henderson said Ms Ley was losing the party's support.

Internal division over the commitment to net-zero emissions by 2050, as well as polling this week showing the coalition's primary vote dropping to a record-low 24 per cent, has heightened the pressure on Ms Ley.

Asked if the Liberal leader would survive, Mr Howard said he believed she should.

"I haven't been a member of parliament for almost 20 years - long time - and the world has changed, but I think Suss

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