Prime Minister Malcolm Turnbull is under pressure to reform political donations amid revelations a Chinese donor paid a debt for Labor's Sam Dastyari.
Both Opposition Leader Bill Shorten and Greens leader Richard Di Natale have written to Mr Turnbull calling for his support to change the rules, including a ban on foreign donations.
Labor has promised to introduce legislation "as soon as practicable" to force disclosure of donations over $1000 - down from the current $13,200 - and ban donation splitting between branches of parties.
It also wants to prohibit anonymous contributions above $50 and stop foreign donations entirely.
"With the majority of Australians and the 226 senators and members of parliament in support of donation reform, it is paramount that you as prime minister support reform," Mr Shorten wrote on Tuesday.
The Labor leader also requests support to ask a parliamentary committee to look into "real time" disclosure of political donations and whether limits should be imposed on candidate contributions.
Senator Di Natale also wrote to Mr Shorten, offering to work constructively with both parties to bring about changes.
It comes as Senator Dastyari faces mounting pressure to step aside after asking a Chinese donor to foot a $1600 personal travel debt and allegedly presenting a view contrary to Labor policy on the dispute in the South China Sea.
The NSW senator apologised for his mistake accepting the cash on Tuesday, but refused to admit he'd declared Australia should remain neutral and respect China in the territory dispute.
Senator Di Natale believes the "terrible mistake" - while inside the rules - proves the system is broken.
"Quite rightly people are concerned that our democracy is for sale," he said in a statement on Tuesday.
"Public trust in politicians has never been lower so let's behave like grown-ups, let's have a conversation about how we fix it."
But Liberal Democrat David Leyonhjelm lashed out at the Greens, saying the party wanted to ban donations from anyone whose activities they disliked, while keeping donations from those they liked.
He believes the Greens are up to "another kind of shady politics".
"If politicians are as easily influenced by donations as Senator Di Natale believes, his members should be worried about donations made to the Greens by the CFMEU," he said, adding those members worked in a range of fields the Greens oppose, such as forestry.
