Independent Victorian MP Geoff Shaw has allegedly assaulted a protester outside parliament.
Witnesses allege the Frankston MP assaulted an elderly man who was protesting against proposed changes to taxi registrations.
The incident was captured on a phone camera.
"I took video footage of Mr Shaw physically pushing a man down and swinging his arms around him causing physical damage towards their faces," Louie Karkatzoulis told reporters.
"He got a bit physical and out of control."
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Police confirmed they were investigating the incident.
Mr Shaw went into parliament for question time and was not immediately available for comment.
Mobile phone footage shows protesters surrounding Mr Shaw as he walks up the front steps outside parliament.
A man stands in front of Mr Shaw who then pushes him aside and the man falls to the ground, the footage shows.
Mr Shaw stepped over the man and continued walking into parliament.
The man is being interviewed by police.
Witness Natalia Potapova said protesters had been expressing their concerns about the taxi industry to Mr Shaw.
"I just saw Geoff Shaw push an elderly gentleman, 80 years old man who was hurt as a result of Geoff Shaw's reactions," she told reporters.
"It was a push. The elderly gentleman, he's got blood on his face as a result of Geoff Shaw's actions."
