In my institution -the Sierra Leone Roads Authority (SLRA), the project manager reports to the director general. The project manager can challenge schedules and tasks for for project funded by government, but they need to get the permission of the director general to change any budgets, deadlines, or requirements. For project funded by the ministry of finance, the minister's approval is required and project funded by Road Maintenance Fund Administration (RMFA), the CEO approval is required.
The project manager give update to the director general on a monthly or quarterly basis. For government projects were donors are involved, the project manager cannot challenged the schedule and tasks as they need to get the permission of the donor to change any budgets, deadlines, or requirements if possible.