Texas joined the Volkswagen AG litigation bandwagon, accusing the company’s U.S. unit of violating state consumer protection laws and clean air standards by using rigged software in some of it diesel vehicles. The state’s claims, in two lawsuits by Texas Attorney General Ken Paxton in state court in Austin, follow similar actions brought by West Virginia and a separate case by the county that encompasses Houston. The lawsuits are part of the widening fallout from the U.S. Environmental Protection Agency’s Sept. 18 announcement that Volkswagen installed deceptive software to make vehicles appear as if they met emissions standards.