British Muslim leader Taji Mustafa has hit back at claims from Opposition Leader Tony Abbott that he is a "preacher of hate", saying the comment is irresponsible and opportunistic.

Mr Mustafa flew out of Australia last night after speaking at a conference in Sydney over the weekend which was organised by his political group, Hizb ut-Tahrir.

The conference, called Muslim's Rise - Caliphate Imminent, encouraged the establishment of a global Islamic state and sharia law.

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