Legal challenges to the healthcare law were filed by More than a dozen state attorneys general on Tuesday, soon after U.S. President Barack Obama signed the measure.

An attorney representing 13 of the 14 states told ABC News that the lawsuits focus on the mandate requiring individuals to buy health insurance. The lawyer further said that the states also expressed concern about the new law imposing unfunded mandates on state governments.

David Rivkin Jr., representing 13 states, said, "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."

ABC also reported that more states are expected to file legal challenges.

Florida Attorney General Bill McCollum, a Republican running for governor, said during a news conference, "We simply cannot afford the things that are in this bill that we're mandated to do. It's not realistic. It's not hype, it's just very, very wrong."

Attorneys general from South Carolina, Nebraska, Texas, Utah, Louisiana, Alabama, Michigan, Colorado, Pennsylvania, Washington, Idaho and South Dakota joined Florida in the lawsuit. Virginia filed a separate suit in federal court in Richmond because it has a state measure that would block such a mandate.

State Democratic Party Chairman Dwight Pelz said, "The public has a right to know whether McKenna generated this idea himself or whether he is acting on behalf of the National Republican Party or the Insurance Industry."

She has made it clear to McKenna "that I will actively oppose this lawsuit if it moves forward," said Washington Gov., Chris Gregoire.  (With Inputs from Agencies)