HARRISBURG — Pennsylvania Attorney General Tom Corbett says he's joined a legal challenge to the constitutionality of the new federal health-care law because he says he believes the government shouldn't be forcing people to buy health insurance.

Corbett said Tuesday the new law threatens individual liberties and infringes on the rights of states.

Corbett is among 13 state attorneys general to file a lawsuit against the new legislation within minutes of it being signed by President Barack Obama.

Corbett, a Republican, is running for governor.

State Democratic Party Chairman T.J. Rooney criticized Corbett, saying it is wrong for him to use the office of attorney general for political posturing.

He says Corbett is siding with insurance companies over the people who will get health insurance as a result of the bill.