Foreign Minister Julie Bishop will try to coax the US to rejoin the Trans-Pacific Partnership trade pact.
Australia, New Zealand, Canada and Japan are among the 11 Pacific nations that will officially sign the the deal in March.
The agreement was thrown into disarray last year when US President Trump pulled the US out, but he has recently hinted he could be open to the TPP if America received a better deal.
"The agreement has an open architecture and we welcome additional members in the future if they are willing to abide by its principles and play by its rules," Ms Bishop told a G'Day USA event in Los Angeles.
"Australia will encourage US participation."
Prime Minister Malcolm Turnbull is less optimistic the US could change heart.
"I don't expect the United States to join the TPP any time soon - we're certainly not counting on it," Mr Turnbull said on Friday.
The agreement would eliminate more than 98 per cent of tariffs in a trade zone with a combined GDP of $US13.7 trillion.
