A shake up of the Liberals front bench in the wake of Andrew Hastie's departure has been revealed by Opposition Leader Sussan Ley, as her popularity plummets after weeks of infighting.

Mr Hastie resigned earlier in October from his role as opposition home affairs spokesman in Ms Ley's shadow cabinet following a dispute on how the party deals with climate change and immigration.

Following the resignation, Tasmanian senator Jonathon Duniam will take over the West Australian MP's portfolio.

"Given its direct link to the ongoing safety and security of the Australian people, the allocation of this portfolio is one of the most significant decisions a prime minister or leader of the opposition makes," Ms Ley said in a statement.

"Senator Duniam, one of the coalition's most talented parliament

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