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The ink on President Obama's signature was barely dry when attorneys general in 14 states filed papers in federal court today challenging the constitutionality of the newly signed health care bill.

"We are convinced that this legislation is fundamentally flawed as a matter of constitutional law, that it exceeds the scope of proper constitutional authority of the federal government and tramples upon the rights and prerogatives of states and their citizens," David Rivkin, Jr., an attorney representing 13 of the states, told ABC News.

The challenges to the legislation focus on the mandate that requires an individual to buy health insurance. The states are also worried about the extent to which the statute imposes a financial burden -- in resources and personnel -- on them. Read more.