The federal government is resisting pressure to ban a controversial British commentator from coming to Australia after Donald Trump's son accused the opposition of trying to silence conservatives.
Labor has called for Raheem Kassam, a former Breitbart editor-in-chief, to be banned from coming to Australia for a conservative conference next week after he called the Koran "fundamentally evil".
He also tweeted that Scottish National Party leader Nicola Sturgeon should have her legs taped shut "so she can't reproduce". Ms Sturgeon has previously spoken about her experience of miscarriage.
But the government, while insisting it doesn't comment on individual cases, is defending his right to free speech.
"For people who may hold controversial views, any impact of those views must always be balanced against Australia's well-established principles of freedom of speech," Immigration Minister David Coleman told parliament on Thursday.
Mr Kassam is listed as a speaker at the Conservative Political Action Conference in Sydney next weekend.
Mr Trump Jr paid unusual attention to Australian politics, calling Labor's move "insanity".
"We have Big Tech constantly trying to silence conservatives and now one of the major political parties in Australia is trying to silence Raheem Kassam because of his conservative views," he tweeted.
"The insanity needs to stop!"
Opposition home affairs spokeswoman Kristina Keneally responded to the Trump tweet by listing other right-wing figures the Morrison government has blocked from entering Australia.
"Mr Trump, please know that Scott Morrison's government banned Milo Yiannopoulos from entering the country in March, David Icke in February, and Gavin McInnes in November last year," she tweeted.
But government frontbencher Alex Hawke said Senator Keneally was the one publicising Mr Kassam's views.
"I've never heard of this guy before; I checked with my office, nobody in my office had ever heard of him before; I checked with my family, they had never heard of this guy before," he told Sky News.
"The only way people are hearing about this guy in Australia is because Kristina Keneally is seeking to ban him."
Opposition frontbencher Tanya Plibersek said it was important to support free speech but a line had to be drawn "when people are coming to Australia to vilify groups in our community".
Labor has questioned the character of other speakers, including US congressmen Mark Meadows and Matt Gaetz.
UK Brexit Party leader Nigel Farage is also due to speak, while Australian speakers include former prime minister Tony Abbott, Liberal senator Amanda Stoker and MP Craig Kelly.
Senator Stoker said her talk at the conference was about improving economic productivity, and distanced herself from Mr Kassam's comments.
In a letter to Senate President Scott Ryan, government Senate leader Mathias Cormann said the best way to defeat bad ideas was through debate.
"The attendance of current and former members and senators at CPAC is a matter for those individuals," he wrote.
"Their attendance at this conference does not imply agreement or endorsement with the views of any of the other speakers attending in any way."
Australian Associated Press