Businessman Clive Palmer is in trouble with Australia's medicines regulator, accused of spreading "misleading information" about COVID-19 vaccination.
The Therapeutic Goods Adminstration says it has written to Mr Palmer and the Grant Broadcasters Radio network, adding the information "provides an incorrect picture" of the safety of vaccines.
It's understood the TGA is concerned about a radio ad that claims more than 200 deaths have occurred in Australia because of adverse reactions to COVID-19 vaccinations.
The TGA said in a statement it had found only one case where an individual with vaccine-related thrombosis or any other related condition had died.
"Such misinformation, in the course of the COVID-19 pandemic, poses an unacceptable threat to the health of Australians," the TGA said in a statement on Tuesday.
"Public figures have a responsibility to be factual and to not undermine our health through spreading misleading information.
"The head of the TGA, Adjunct Professor John Skerritt has written to both Mr Palmer and the CEO of the Grant Broadcasters Radio network to remind them of this responsibility."
Last week, Mr Palmer issued a statement saying he was considering legal action to stop the country's vaccine rollout.
In the statement he said a TGA report had showed the vaccine was responsible for 210 deaths and 2000 adverse reactions.