Queensland senator Fraser Anning has been egged while speaking to the media at a political meeting at Moorabbin in Melbourne's south-east.
The young man was later led away by police.
A rabidly anti-Muslim politician in Australia is facing widespread denunciation after immediately blaming a Friday mass shooting in New Zealand - which killed more than 40 people at two local mosques - on the Muslim faith and Muslim immigration.
Now, responses on Twitter seem to be split between calling for the kid's canonisation/immediate recognition by the Order of Australia, and wondering if Senator Anning is going to be prosecuted for assaulting a minor.
Anning went on to criticize "left-wing politicians and the media" who he said will rush to blame "gun laws or those who hold nationalist views, but this is all clichéd nonsense".
Grieving members of the public following a shooting at the Al Noor mosque in Christchurch, New Zealand, March 15, 2019 New Zealand's Prime Minister Jacinda Ardern speaks on live television following fatal shootings at two mosques in central Christchurch, New Zealand March 15, 2019, in this still image taken from video.
Anning said Muslims had been the victims in the Christchurch attack but "usually they are the perpetrators".
Morrison said that the views expressed by Senator Anning had "no place in Australia, let alone the Australian parliament".
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Last year, in a Parliament speech, he reportedly called for a "final solution" to Muslim immigrants, recalling the term used by Holocaust-era Nazis to describe the extermination of Jews in Europe.
Labor Opposition Leader Bill Shorten also slammed the "obscure" Senator.
A "racist" Australian senator has been condemned after he blamed the New Zealand terror attack on Muslim immigration.
"The senator in question, I do not think operates by the beat of the same drum as the rest of us", he said.
"No, but we do see the link between certain senators and violence", wrote one man on Twitter.
"It is heart-breaking that people, praying in a mosque, should be mowed down".
In another tweet he doubled down saying Friday was not an "excuse" to forget lives lost to "Islamic terrorist attacks".