"Hell will freeze over" before Queensland federal MP George Christensen gives in to the "intimidation" of an online petition trying to stop him speaking at an anti-Islam rally.

The Mackay-based backbencher hit out at activist group GetUp for hosting a petition calling on Prime Minister Tony Abbott to block his attendance at Sunday's Reclaim Australia rally in the central Queensland city.

Reclaim Australia trumpeted Mr Christensen's involvement on Tuesday and the petition had been posted within a day, calling on Mr Abbott to denounce the group and block his MP from attending.

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