Lucas read out the post, written by Woodville High School teacher and union delegate Regina Wilson, in state parliament.

“I am going to try to ensure that the next generation of voters in my classroom don’t vote Liberal,” wrote Wilson.

“Without being political of course, as I won’t tell my students what to think, but I teach them how to be critical thinkers who question those in power and especially those who seek to keep the status quo for the rich, upper classes and refuse to acknowledge the rest of us...”

Lucas did not identify Wilson in parliament, but did provide the name of her school.

She was subsequently named in a series of articles by The Australian.

Lucas said that the post represented “a clear breach of the publicly enunciated values of the education department”.

“There were similar further posts from this particular union branch delegate from the western urban area of the AEU. Those statements by that particular union delegate, in my view, are outrageous and unacceptable. They are clearly an indication of a deliberate decision to introduce partisan political politics into that particular teacher's classroom...” he said.

Lucas said that he would continue to “call out outrageous behaviour by union bosses and their lackeys within the union movement wherever and whenever I see it”.

Speaking to EducationHQ, Lucas said that he did not have a problem with Wilson being publicly identified.

“She's an adult, she's posted it herself. As I said, I think contrary to the claims that she's making, that this is a private post, the AEU Facebook page isn't a private [page]...

“My understanding from friends and colleagues who are members of the AEU is that they have their own internal, accessible only to members pages or communication channels, so all of those are available to her as an individual AEU delegate or member if she wants to. This is a public page, so she would have known that.”

Lucas said that any repercussions for the post are now a matter for the Department of Education.

“I've been around a long time, there are accepted practices in terms of protesting against government decisions, whatever it is,” he said.

“[Teachers] are perfectly entitled to take industrial action as long as it's lawful, they can protest after hours which is what they've done on a number of occasions, they've written letters, issued press releases, public statements, all those sorts of things are fine, but I don't think any parent or grandparent or fair-minded observer would believe that you should be in essence involving students in this particular way...

“I don't think that anybody's going to defend that sort of approach to teaching in the classroom.”

AEU state president Howard Spreadbury, who was contacted for comment, later told The Australian that Wilson’s post should be investigated by the Department of Education.

Wilson was also contacted for comment.