Labor frontbencher Ed Husic says a new Liberal senator would have been disciplined if he shared social media posts attacking groups other than Muslims.
Jim Molan shared posts from extremist group Britain First - which has been linked to murders and terror attacks on Muslims - on his Facebook page last year and has refused to apologise for posting them.
Prime Minister Malcolm Turnbull strongly defended Senator Molan in Question Time on Tuesday(February 6).
But Mr Husic said the Liberal leader would not have done it if the posts had been misogynistic or homophobic.
"If anti-Semites had posted something terrible about my friends in the Jewish community, would we have received the same approach from the prime minister?" Mr Husic asked on Sky News on Wednesday.
"I doubt it, rightly so.
"I think he would not even hesitate to come out and say that was the wrong thing. He didn't in this case."
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