A taxi company from Geoff Shaw's Frankston electorate has backed the independent MP, saying it is disappointing he was "physically attacked" on the steps of parliament.
Frankston Radio Cabs released a statement supporting Mr Shaw over his scuffle with an elderly protester who was rallying against taxi industry reforms on Tuesday.
"A great injustice has occurred outside Parliament House with a political rally which turned violent," managing director Kevin Dunn said.
"While we can understand the angst, concerns and frustrations of all taxi owners, operators and drivers, Frankston Radio Cabs Pty Ltd is disappointed that our member for Frankston Mr Geoff Shaw has been physically attacked on the steps of Parliament House."
Mr Dunn said Mr Shaw was the only MP to stand his ground against the government earlier this year, defending the taxi industry from harsh reforms.
"Mr Shaw's actions, accessibility and strong support for taxi operators has in fact helped many families in the taxi industry," he said.
The protesters were also criticised by former premier Jeff Kennett.
"I do not mind you trying to speak to politicians but, when you lay a hand upon them, then I'm afraid you are crossing the line," he told Fairfax Radio.
New security footage showing Mr Shaw being hassled on his way into parliament was released to the media on Wednesday.
The footage shows a female protester tugging at Mr Shaw's arm as he walks along the footpath near parliament before others join in and appear to surround the MP.
Taxi owner John Zammit appears to grab Mr Shaw's arm, holding on to him as the MP walks away, before running up the stairs to again confront him. The 74-year-old is then pushed over.
Opposition Leader Daniel Andrews on Wednesday was scathing of the incident and called on Premier Denis Napthine to expel Mr Shaw from the Liberal Party.
But Mr Andrews says the new footage does not change his mind about the scuffle.
"Mr Shaw's behaviour was not an appropriate way to conduct himself," he told reporters on Thursday.
"Geoff Shaw didn't finish up on the ground bleeding - a grandfather in his 70s did."
Deputy Premier Peter Ryan said the new footage illustrated the need to wait for all evidence before casting judgment, saying the vision put a "different position on things".The protesters were not present on the parliament steps on Thursday.