The joint lawsuit led by Florida and now grouping 18 states was filed on March 23 by mostly Republican attorney generals.
It claims the sweeping reform of the $2.5 trillion U.S. healthcare system, pushed through by Democrats in the Congress after months of bitter partisan fighting, violates state-government rights in the U.S. Constitution and will force massive new spending on hard-pressed state governments.
The Florida-led lawsuit says the health overhaul -- which expands government health plans for the poor, imposes new taxes on the wealthy and requires insurers to cover people with preexisting medical conditions -- violates the Constitution's commerce clause by requiring nearly all Americans to buy health insurance.
"On behalf of the residents in Florida and the states joining our efforts, we are committed to aggressively pursuing this lawsuit to the U.S. Supreme Court if necessary to prevent this unprecedented expansion of federal powers, impact upon state sovereignty, and encroachment on our freedom," McCollum said in a statement released by his office.