A coalition bitterly divided over climate policy may need to find a hasty resolution as MPs tussle internally over whether to back Labor's emissions reduction target.

A Liberal heavyweight has threatened to abandon his post if the coalition remains committed to a net-zero emissions by 2050 target, declaring his position before a policy review after the party's heavy defeat at the federal election in May.

Coalition home affairs spokesman Andrew Hastie, who has declared himself as an aspirant for the Liberal leadership in the future, said he would resign from the front bench if a net-zero policy was adopted.

Cabinet and shadow cabinet ministers are bound by solidarity and must toe the party line on policy or forfeit their positions.

Mr Hastie said he had "nailed my colours to the mast" o

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