WASHINGTON, D.C. - The U.S. Supreme Court on Dec. 2 invited the solicitor general to file a brief expressing the views of the United States regarding whether to grant review of a Ninth Circuit U.S. Court of Appeals ruling that the Natural Gas Act (NGA) does not preempt state law claims asserted by retail purchasers of natural gas (In re: Western States Wholesale Natural Gas Antitrust Litigation $(ONEOK, Inc., et al. v. Learjet, Inc.$), No. 13-271, U.S. Sup.).