"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.

Nationals MP George Christensen (right) says a petition calling on Prime Minister Tony Abbott to block him from attending a Reclaim Australia rally is "intimidation". Credit:Alex Ellinghausen

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.

"Hell will freeze over before I give in to such intimidation," The Nationals MP posted to Facebook on Thursday.