A petition has been launched calling for Sioux City Mayor Bob Scott to resign over his role in replacing the Argosy Sioux City gambling boat with the Hard Rock Hotel & Casino, the Sioux City Journal reported. The petition came as Argosy owners stepped up criticism this week of Scott and other city leaders. Penn National Gaming Co., which operates Argosy, is questioning the impartiality of city officials during the selection of a land-based casino. Scott dismissed the charges. Click here to sign up for the weekly Business Record Iowa newsletter, which gathers business news from around the state.