The qualified voters shall have the power to recall the Mayor or any member of Council, whether elected by popular vote or selected to fill a vacancy, and may exercise such power by filing with the City Clerk a petition signed by qualified voters of the City equal in number to at least 20 percent of the total number of qualified voters registered to vote at the last regular City election. The petition shall be signed and verified in the manner required for initiative and referendum petitions, shall contain a demand for the removal of the subject officer or officers and shall contain a general statement of the reasons for which the removal is sought.