WASHINGTON (AP) — The Trump administration has told a federal appeals court it wants the entire Affordable Care Act struck down, an outcome that could leave millions uninsured and revive a winning political issue for Democrats.

The administration, in a terse filing Monday with the court in New Orleans, said the entire health care law should be struck down as unconstitutional after Congress repealed its unpopular fines on people who remain uninsured.

That position is at odds with previous statements by leading congressional Republicans who said they did not intend to repeal other parts of the law when they cut out its fines, effective this year. It's also a departure from the administration's earlier stance in a lower court, where it had argued that only federal protections for people with pre-existing medical conditions and limits on premiums charged to older, sicker people should be struck down.

"Donald Trump and Republicans are obsessed with taking health care away from millions of Americans," Democratic Party Chairman Tom Perez said in a statement Tuesday. "It is an indisputable fact that the Affordable Care Act has saved lives, and Democrats will do everything in our power to protect it."

The Justice Department did not explain its reasoning in a two-sentence letter to the court, but promised a full and timely explanation for the appeals judges. It's rare for the Justice Department to decline to defend a federal law.

The case brought by Texas and a group of GOP-led states seems headed for the Supreme Court. District Court Judge Reed O'Connor in Fort Worth earlier ruled in favor of the plaintiff states and Democratic-led states have appealed to the 5th U.S. Circuit Court of Appeals in New Orleans.

The Supreme Court has twice upheld the Obama-era law. Five justices — a majority — who upheld the law in 2012 are still on the bench. They are Chief Justice John Roberts and the court's four liberals.

Repeal of the ACA in its entirety would risk making more than 20 million people uninsured. That includes some 12 million low-income people covered through its Medicaid expansion, and some 11 million purchasing subsidized private health insurance through HealthCare.gov and state-run insurance markets.

Some Republicans say that wouldn't happen because the Trump administration's "repeal and replace" plan would send grants to states for them to run their own health insurance programs. However, during the 2017 congressional debate over repealing the health law, the nonpartisan Congressional Budget Office estimated the GOP replacement plans would result in steep coverage losses.

President Donald Trump has never given up on repealing "Obamacare," and is still complaining about the vote by the late GOP Sen. John McCain of Arizona that saved the law. The latest Trump administration budget also calls for repeal. But that possibility was foreclosed when Democrats won control of the House in last year's midterm elections.

Judge O'Connor's ruling rests on a legal analysis that the congressionally repealed fines for going uninsured are central to the law. O'Connor noted that the Supreme Court upheld the law in 2012 because its requirement for Americans to carry health insurance was enforced through fines that passed constitutional muster, since they were levied as taxes.

With the fines gone, the coverage requirement can no longer be considered constitutional, O'Connor reasoned, and the entire health law is defective because it can't be separated from the coverage requirement.

But California Attorney General Xavier Becerra, heading up the Democratic state officials defending the law, says that view strains the meaning of underlying federal laws and the clear intent of numerous Republican lawmakers who voted to repeal the ACA's fines.

"The administration is choosing to neglect the rule of law and play politics with the health care of tens of millions of Americans," Becerra said in a statement Tuesday. The Democratic-led House under Speaker Nancy Pelosi has also voted to join the case in defense of the health law.

Signed nearly 10 years ago by then-President Barack Obama, the health law remains in place while the lawsuit continues. House Democrats, meanwhile, are unveiling broad legislation on Tuesday to shore up the Affordable Care Act and expand enrollment to millions more people.

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Mark Sherman contributed to this report.