Diplomatic staff at Australian embassies could be at risk of being targeted by far-right extremists motivated by a coalition MP, Labor has warned.
The alarm comes after government backbencher George Christensen used an appearance on a US conspiracy theorist's online show to advocate for protests outside Australian consulates over the country's COVID-19 restrictions.
The Queensland MP was interviewed on Alex Jones' InfoWars program, which has been banned on Facebook and YouTube for hate speech violations and has made multiple false claims about the pandemic.
Mr Christensen has been condemned by senior Nationals MPs for his comments on the program.
Labor senator Katy Gallagher said the comments could lead to Australian diplomats in consulates being targeted.
"Encouraging protest action or inciting violence at Australian embassies overseas, where we have public servants working in the national interest ... is a particularly dangerous comment," she told reporters in Canberra.
"He finds that funny, (but) this is a line that has been crossed."
At one point during the interview, Mr Christensen laughed when Mr Jones compared Australia's quarantine facilities to the Auschwitz concentration camp.
Acting Nationals leader David Littleproud said he condemned the comments and had spoken with Mr Christensen.
"(It) was an error of judgment for him to go on that program," Mr Littleproud said.
"I have asked him to reflect on that, and his judgment around having an interview with a US commentator that has somewhat of a chequered past."
The Queensland MP, who is retiring at the next election, previously compared restrictions to the regimes of Adolf Hitler and Pol Pot during a speech in parliament, and also urged civil disobedience.
Senator Gallagher said the comments were indicative of a pattern of behaviour from Mr Christensen and urged Prime Minister Scott Morrison to bring him into line.
"(Mr Christensen) has consistently been out spreading disinformation, misinformation, stoking division and fear," she said.
"It's got to a point when the prime minister should be taking action. I can't imagine a situation under any other prime minister where a member of their own government would be allowed to be free-range like this."
However, Nationals senator Matt Canavan said he did not have a problem with Mr Christensen appearing on InfoWars.
"Just because you go on a show, doesn't mean you agree with everything," he told Sky News.
"People are free, of course, to protest ... Australian government policies, wherever they are in the world."
