The Montreal Police Brotherhood is defending an officer who faces disciplinary action for writing and broadcasting a song about immigrants in Quebec.

The 37-year-old officer did nothing wrong when he composed and posted a song that includes advice for new immigrants, who should try to fit in or get out of Quebec.

The song, posted anonymously on a popular Quebec humour site, does not compromise the officer's status as a police officer, said Brotherhood president Yves Francoeur.

"It doesn't change anything. He's got the right to write songs like that, and it doesn't have anything to do with his work," he told CBC on Monday.

Montreal police began an internal investigation that could lead to disciplinary action if it determines the officer breached the force's code of conduct.

As far as the Brotherhood is concerned, the officer was simply exercising his rights as a private citizen.

"That's the free expression guaranteed by the Canadian and Quebec charter, and he's been writing songs for years, he's [been] singing songs for years," Francoeur said.

The officer had reportedly written other humorous songs about the police force.

He remains on the job as the force pursues the internal investigation.