35 ILCS 200/19-65
A surety on any bond may ask to be released from any further liability at any time after the execution of that bond, if the surety has reason to believe that the officer named in the bond will fail to comply with the conditions thereof. To be released, the surety shall file with the county clerk a notice in writing, verified under oath, setting forth the facts in the case; whereupon the clerk with whom the notice is filed, shall notify the officer to give additional security, equal to the security about to be released by the county board. The notice may be served by the clerk, or by any person appointed by the board or clerk. If the officer so notified does not appear and give additional security within 2 days after notification, the county board may remove him or her from office. The presiding officer of the county board, with the advice and consent of the county board, shall appoint some person to fill the vacancy occasioned by the removal, who shall execute bond, qualify and perform the duties required.
35 ILCS 200/19-65