Barnaby Joyce says he will not seek re-election for the northern NSW lower house seat of New England, citing irreconcilable differences with the National Party leadership.

While he remains a member of the Nationals, his comments have fuelled speculation about a move to One Nation.

Joyce began his parliamentary career as a Nationals senator for Queensland in 2004, and quickly earned a reputation for crossing the floor during the Howard government's reign.

In the two decades since, he has frequently been in the spotlight, described as one of parliament's more colourful and controversial characters.

Here are some of the more memorable events that have punctuated his parliamentary career.

Picking a fight with Johnny Depp

Johnny Depp and Amber Heard, who were married at the time, flew in

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