(Reuters) – The U.S. Supreme Court has been asked to review a case about whether the federal government can subsidize health insurance for millions of Americans, a party involved in the lawsuit said on Thursday. The petition requests the U.S. high court decide the issue after two lower U.S. court rulings created uncertainties last week regarding the legitimacy of subsidies for individuals enrolled on federally run exchanges under the Affordable Care Act, or Obamacare. The Competitive Enterprise Institute, which is coordinating and funding the cases, filed the petition, according to the not-for-profit’s website.