But Vice President Mike Pence assured Turnbull during a visit to Australia last month that the Trump administration will honor it, but "that doesn't mean we admire the agreement".
Democrats, and more than a handful Republicans, say Trump's health care plan will leave millions of Americans without insurance and raise private costs for those with pre-existing conditions.
The presidential motorcade passed hundreds of demonstrators as it arrived at the decommissioned aircraft carrier Intrepid in the early evening for a meeting with Australian Prime Minister Malcolm Turnbull hours after it was originally scheduled. "It's going to be fantastic health care", Trump said of the GOP's controversial AHCA.
The bill to repeal and replace significant parts of the Affordable Care Act (Obamacare) passed the Republican-controlled House of Representatives, leaving millions of Americans facing the prospect of losing their health insurance. "Thank you, Mr. President, we'll quote you on the floor of the Senate".
CNN's panel seemed to assume Trump was just being chummy and flattering with Turnbull without concern for the substance of what he was saying.
House Republicans didn't even wait for the CBO to score its final version of a bill they passed that would remake one sixth of the economy and effect nearly every American.
Trump, high from the thrill of advancing his first major legislative priority, hosted lawmakers in the Rose Garden at the White House to mark the occasion.
Australia's healthcare system is run by the federal government, which Sanders quickly pointed out. "We reaffirmed the tremendous friendship between the United States and Australia and the vital importance of our security and our alliance".
Australia's government provides nationalized health care, and the country spends about half as much as the US does to provide it.
"We want him to know the resistance remains, even in his hometown", said Ruthie Adler, 30, a Manhattan waitress.
In the U.S., the new Republican bill will significantly cut the amount of government support for Medicaid, which provides health care support to some United States citizens.
Trump is in the city to meet with Australian Prime Minister Malcolm Turnbull and commemorate a World War II battle that reinforced the ties between the US and Australia.
"Oh yeah sure", Mr Trump said when asked about the U.S. accepting refugees held on Manus Island and Nauru.