Morrison will be speaking at the event to be held in Sydney on Saturday, April 23, alongside Christian author Eric Metaxas, conservative News Corp columnist Miranda Devine and Indigenous leader Noel Pearson.

But Greens LGBT spokesman Robert Simms says the ACL is simply a hate group which should not be validated by the Treasurer.

"The Liberals need to stop legitimising these hate merchants. The ACL are an extreme organisation. Why on earth the federal Treasurer would be wanting to legitimise their political approach is beyond me," he said.

Simms also called on prime minister Malcolm Turnbull to stand up to the conservative forces within his own party.

"When it comes to Malcolm Turnbull, actions speak louder than words. Even though he talks about offering a different direction to Tony Abbott, he's been found to be severely wanting."