Donald Trump Junior has criticised the Australian Labour Party’s call for conservative activist Raheem Kassam to be blocked from visiting Australia.

The former Breitbart editor-in-chief is due to speak at the Conservative Political Action Conference in Sydney next week alongside Tony Abbott and Brexit campaign leader Nigel Farage.

Labor's Home Affairs spokeswoman Kristina Keneally said the government should revoke Mr Kassam's visa for his derogatory comments made about women and Islam.