Earlier this week, a report from the parliamentary joint committee on human rights found Warren Entsch's cross-party bill for marriage equality would help end discrimination.

However, government MPs Michael Sukkar, David Gillespie and Matthew Canavan penned a dissenting report, arguing the reform would infringe the human rights of marriage celebrants, service providers, and children.

Greens MP Adam Bandt described the three politicians as "bigots scraping the bottom of the barrel" on Wednesday.