The federal government's "Freedom Commissioner", Tim Wilson has backed the decision to grant Dutch anti-Islam MP Geert Wilders a visa to visit Australia.

But Treasurer Scott Morrison says the controversial MP - like anyone who visits Australia - should not "import the debates from overseas" and should treat all Australians with respect.

And Muslim community advocate Rebecca Kay said sections of the Muslim community viewed Mr Wilders as a "hate preacher" and the decision to grant him a visa will damage the governments' de-radicalisation efforts.

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