Consumers who buy Halal products could be funding Islamic extremism, an Abbott government backbencher claims.

In an opinion article titled Terror in the Tucker Box, Nationals MP George Christensen questions whether shoppers who buy goods with the Halal logo are funding a push for Sharia law - or even backing terrorists.

Mr Christensen says there's no way to know where the funds from Halal-certified goods end up, despite conceding one certifier builds mosques and funds education programs with the money.

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