A group of individuals and businesses filed a lawsuit against the Obama administration's healthcare overhaul on Thursday, hoping to stop the law in states that have not set up new insurance exchanges. The complaint filed in the Washington federal court challenges federal rules issued in 2012 for implementing the president's 2010 healthcare law which goes into full force in January 2014. The 12 challengers, ranging from a hospital chain to a restaurant franchise, argue that Internal Revenue Service rules issued last year should be invalidated because they contradict what Congress originally intended.
