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Sky News host Jenna Clarke says the One Nation vote should not be "underestimated" after leader Pauline Hanson said her party will encourage supporters to preference Labor in the election.

“I think a lot of people are going to have to pay very close attention to how they vote, because every vote does matter, it always has mattered,” she told Sky News host Cory Bernardi.

“I don’t think it’s ever mattered as much as it will in 2022.”