US Republicans have warned of possible 'punitive measures' over Australia's Palestine stance. Photo: Dave Hunt/Mick Tsikas/AAP PHOTOS

Australia has been urged not to ignore threats of "punitive measures" from top Republicans, as the prime minister lands in the US for one of his most important diplomatic ventures.

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Anthony Albanese arrived in New York City on Sunday morning Australian time ahead of a long-awaited United Nations General Assembly meeting where Australia, Canada, France and the UK will recognise the state of Palestine.

But hours before touchdown, a group of top Republic

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