Trump administration asks US Supreme Court to end Obamacare
The third challenge to the landmark law, formally known as the Affordable Care Act, comes as the United States records some of its highest coronavirus infection rates since the contagion hit the country.
Under Obamacare, millions of Americans are required to buy health insurance or face a tax penalty.
But in 2017 Congress eliminated the fine for people who failed to sign up -- known as the individual mandate -- removing a key part of former president Barack Obama's policy.
The Department of Justice (DoJ) argues "the individual mandate is not severable from the rest of the Act."
Because of that "the mandate is now unconstitutional as a result of Congress's elimination ... of the penalty for noncompliance," it said in a late filing.
As a result "the entire ACA thus must fall with the individual mandate."
The DoJ also argues that ACA coverage protecting people with pre-existing conditions -- rules that mean insurers cannot refuse customers because of their age, gender or health status -- should also be overturned.