Liberal senator Cory Bernardi says Australia should welcome Dutch anti-Islam politician Geert Wilders to Australia because he could be the Netherlands' next prime minister.

Mr Wilders, who heads the right-wing political party The Party for Freedom and is a prominent critic of Islam, announced on Twitter that his Australian visa had been granted after what his supporters had said was a delay in processing his application.

The controversial figure will come to Australia to launch a new political party called the Australian Liberty Alliance, which advocates against what it describes as the "Islamisation of Australia".

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