Outspoken Nationals member George Christensen would struggle to keep his Queensland seat if an election were held today, with voter support for Pauline Hanson's One Nation and the Liberal/National party now neck and neck, according to new polling.

One Nation and the LNP now have 30 per cent each of the primary vote, according to polling last week by ReachTEL and commissioned by the Australia Institute.

Mr Christensen, who has threatened to quit the Coalition and defect to One Nation over issues such the sugar cane farmers' dispute, the backpackers' tax, a banking royal commission and same-sex marriage, is one of the government's most vulnerable MPs with a margin of only 3.3 per cent after last year's election.

George Christensen, the federal member for Dawson, has been fighting on behalf of cane farmers. Andrew Meares

"One Nation are clearly on the rise, and this polling shows in a seat like Dawson in regional Queensland they could challenge for lower house representation," the Australia Institute's Ben Oquist said.

"This polling however also points to a major rift between key Coalition policies and voters in this long-time Coalition seat."