Barnaby Joyce has warned that anti-Islamic statements could harm Australian trade deals and declared that he would give instructions not to preference Pauline Hanson's party before the Liberal party in federal seats.

In an interview to mark his first year as National party leader, Joyce said that, as agriculture minister, he had to deal with a lot of Islamic countries that buy billions of dollars' worth of Australian exports.

"So just be a little bit cautious about what you say at times because I have to go to Indonesia, I have to go to Saudi Arabia, they are the biggest buyers of our wheat, they are the biggest buyers of our cattle," Joyce told Guardian Australia.

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