Robert Irwin, son of legendary wildlife warrior Steve, has sent legal letters to Pauline Hanson 's One Nation insisting it take down a cartoon he claims is defamatory.

One Nation leader Pauline Hanson has hit back after receiving a legal threat from Robert Irwin over the latest episode of her Please Explain cartoon, telling him to “lighten up”.

Robert Irwin has threatened to sue One Nation leader Pauline Hanson for defamation after he was mocked in the latest episode of her Please Explain cartoon.