A controversial Muslim leader has suggested bisexuals will lobby to be allowed a husband and a wife at the same time if gay marriage is legalised.

Keysar Trad made the extraordinary claim after One Nation leader Pauline Hanson slammed him in parliament for declaring Australian men should be allowed multiple wives.

'If the "B" in LGBTIQ lobby for marriage equality, they'd have a chance for plural relations to be recognised,' he told Daily Mail Australia on Tuesday.

'Pauline should forget about me and remember the "B" in 'LBGTIQ'.'

Mr Trad, the former president of the Australian Federation of Islamic Councils, said Muslims were often condemned if they voiced support for polygamy.

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