Controversial Liberal backbencher Cory Bernardi says Islam is responsible for a growing global problem and "mealy-mouthed" politicians who say otherwise are wrong.

It comes as Islamic extremists claimed responsibility for bombings in Brussels that have killed dozens.

"I imagine it will only be a matter of time before the first mealy-mouthed, cultural-relativist politician will say religion has nothing to do with these most recent attacks," Senator Bernardi writes in his "weekly dose of common sense" email.

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