In the case of an infirm president, his counselors may be called upon to perform more of the duties of the First Presidency that would normally be performed by the president. If they are needed, any number of additional counselors may be called to assist them, but the president of the church remains the only person authorized to use all priesthood keys. All members of the First Presidency are sustained by the membership of the church as prophets, seers, and revelators and given the keys of the kingdom when they are ordained as an apostle.
