The federal government's proposed backpacker tax is shaping up as the latest flashpoint to unsettle the Coalition.

Queensland MP George Christensen is threatening to quit the government if it doesn't dump its plan to tax fruit pickers and other farm workers in Australia on temporary visas.

Acting prime minister and Nationals leader, Barnaby Joyce, says the process of implementing the tax continues.

"We're certainly looking at what New Zealand does, and what Canada does. The requirements for an intense upgrade of labor requirements on farms is not unique to Australia."

Mr Joyce joins RN Breakfast.