The Kroger Co., parent company of King Soopers and other grocery chains nationwide, is suing to try to block the Federal Trade Commission’s administrative proceeding against the supermarket giant’s proposed merger with Albertsons. The lawsuit, filed by Kroger on Monday in U.S. District Court in Cincinnati, is challenging the FTC’s attempt to block the merger through administrative action as unconstitutional. The proposed merger is being challenged by state attorneys general, including Colorado’s Phil Weiser, in addition to the FTC.