Prime Minister Scott Morrison has taken aim at mining magnate Clive Palmer for distributing vaccine misinformation, describing it as "complete rubbish".
The former politician is sending out yellow and black flyers across the country, questioning the speed of the development of COVID-19 vaccines.
Mr Palmer also claims appropriate safety checks and balances have not been carried out.
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Mr Morrison said the Federal Government is doing everything it can to clamp down on false vaccine campaigns.
"This is misinformation, pure and simple," he told reporters in Melbourne.
"Don't listen to it.
"It's rubbish, complete rubbish."
The opposition has asked the Australian Electoral Commission to investigate the pamphlets, arguing they should be treated as part of a political campaign by Mr Palmer.
