Video shows the teen pulling out a cellphone and egg as he approaches Sen. Fraser Anning during an interview with reporters, ABC News reported. Anning swiftly punched the teen twice in response.
A staffer for the senator tried to separate the two, while people in the crowd held the teen until authorities arrived.
The 17-year-old was arrested, then released without being charged.
Anning, known for his anti-immigration views and inflammatory rhetoric, was widely condemned for his comments blaming Muslim immigration for Friday's mosque shooting.
The government said it will censure Anning for his comments, 9news reported.
The Associated Press contributed to this report.
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