The move is an escalation of the Trump administration’s legal battle against the health care law.
The DOJ previously argued in court that the law’s pre-existing condition protections should be struck down. Now, the administration argues the entire law should be invalidated.
U.S. District Court Judge Reed O’Connor ruled in December that the Affordable Care Act’s individual mandate is unconstitutional and that the rest of law is therefore invalid.
The DOJ said Monday that it agrees the decision should stand as the case works its way through the appeals process in the U.S. Court of Appeals for the 5th Circuit.