Former NSW One Nation leader Mark Latham is facing defamation proceedings from Sydney MP Alex Greenwich.

The defamation case is over offensive and homophobic comments made by Latham on social media and in interviews.

These comments led to death threats and safety concerns for Greenwich and his staff.

As a result, Greenwich has experienced panic attacks and anxiety, affecting his mental health and questioning his ability to continue in politics.

The Federal Court trial is examining the context of Latham's comments and the events leading to the defamation case.

Both parties are presenting their arguments, with Greenwich and his staff preparing to testify.

Latham refuses to settle outside of court, underscoring the broader implications of hate speech and discrimination in politics.