Olympic swimming champion Ian Thorpe has joined the chorus opposing the Morrison government's proposed religious discrimination laws.
So too has former High Court justice Michael Kirby.
Thorpe voiced his concerns about the bill on Thursday, saying it didn't give any sense of a fair go.
"We know this will discriminate against young and old, it will discriminate against people based on their gender and it will also restrict people's ability and access to be able to use our hospital services and our schools," he told reporters at Parliament House in Canberra.
"It will have a huge impact on the LGBTI community in particular."
Mr Kirby, who is backing a new campaign against the bill called #DontDivideUs, believes all Australians could be worse off under the bill.
"This is not a bill that protects Australians from discrimination on religious grounds. Instead, it actively facilitates intolerance and will work to divide rather than unite Australians," he said in a statement.
"The government should heed the chorus of opposition to this law and abandon this ill-considered measure."
The draft laws - yet to be put to parliament - are aimed at protecting people of faith from discrimination.
The proposal would allow hospitals to hire on religious grounds and give doctors the ability to reject procedures on the same basis.
Business and union groups have this week urged the government to amend the proposal, saying the bill could harm employees
Thorpe travelled to the nation's capital with Equality Australia boss Anna Brown to meet ministers and other politicians.
His request is simple: ditch the plan.
"What we've been hearing from multiple people that have an interest in this is that no bill is better than a bad bill but it is something that we'd be prepared to work on," he said.
"At this stage, my preference would be that this bill is scrapped."
Ms Brown said the bill was friendless, with opposition to the legal changes growing every day.
"This bill is deeply flawed and will take us backwards," she told reporters.
Conservative Liberal senator Concetta Fierravanti-Wells has also spoken out against the proposal, saying no bill would be better than the government's "flawed bill".
Australian Associated Press