Sanders, a self-described democratic socialist who ran for the Democratic presidential nomination past year, also said the Senate should use the Australian system as a model while crafting an alternative to Republican healthcare legislation that Trump endorses.
Bernie Sanders, I-Vermont, who have long advocated for a government-run universal health care option, similar to Australia's Medicare system.
During a press conference with Australian Prime Minister Malcolm Turnbull, Trump was asked by a reporter if he thought the Senate would pass their own bill. "The Australian healthcare system provides healthcare to all of its people at a fraction of the cost than we do", Mr Sanders tweeted on Saturday.
"Well, Mr. President, you're right!"
"We should start off with looking at the Australian health care system".
Prime Minister Turnbull, who spoke about his meeting with President Trump on Friday, indicated that there was a major turn in the relationship between the two men.
Relations between the two leaders were strained over President Trump's reluctance to honour a deal to accept up to 1,200 refugees from Australian detention camps. Sanders said. "That's great".
Trump was spending an extended weekend at his central New Jersey home, about 40 miles west of NY.
Earlier, Mr Trump admitted his infamous first phone call with Mr Turnbull in January "got a little testy", shortly after he insisted to the media the reports were "fake news".
"We have a failing health care", Trump told Turnbull. In the clip, Trump simultaneously criticizes the American healthcare system and lauds Australia's.
Don't be surprised if Trump's comment ends up in some Sanders speeches.
It is now impossible to determine the breadth of coverage that the AHCA would provide because House Republicans voted on the latest version of the bill before the Congressional Budget Office (CBO) could provide an estimate of its impact on the health care market.
And support for a nationalized health care plan wasn't just something Trump talked about during his latest campaign for president.
"This Republican health care bill needs to either be flushed down the toilet or thrown in the garbage", he tweeted Friday. What works in Australia may not work in the United States. "He's fully engaged on the House side, I expect him to be fully engaged on the Senate side and make sure that we get the bill that the American people deserve".
The US president had abruptly hung up the call with the Australian premier after merely 25 minutes, rather than an hour the call was supposed to last.