; or (ii) the cost of the preliminary review. (2) Ban on all subsequent complaints Any person upon whom the Director of the Office of Public Integrity imposes a civil penalty under paragraph (1)(C) may not file a complaint with the Board again. 556. Personnel matters (a) Compensation of employees (1) Appointment Upon a majority vote of the Board, the Board may appoint and fix the compensation of such professional, nonpartisan staff (including staff with relevant experience in investigations and law enforcement) of the Office as the Board considers necessary to perform its duties. (2) Qualifications Each employee of the Office shall be professional and demonstrably qualified for the position for which the employee is hired. (3) Staffing requirements (A) In general The employees of the Office shall be assembled and retained as a professional, nonpartisan staff, and the Office as a whole, and each individual employee, shall perform all official duties in a nonpartisan manner. (B) No partisan political activity No employee of the Office shall engage in any partisan political activity directly affecting any congressional or presidential election. (C) Limitation or public speaking or publication No employee of the Office may accept public speaking engagements or write for publication on any subject that is in any way related to the employee's employment or duties with the Office without specific prior approval from the chairperson and vice-chairperson of the Board. (b) Termination of employees The employment of an employee of the Office may be terminated during a Congress solely by a majority vote of the Board. (c) Reimbursements Members of the Board, and employees of the Office, may be reimbursed for travel, subsistence, and other necessary expenses incurred by members or employees in the performance of their duties in the same manner as is permissible for such expenses of other employees of the House or Senate. (d) Agreements for Members and employees